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To: calsify@ietf.org
From: Alexey Melnikov <alexey.melnikov@isode.com>
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Date: Wed, 1 Jun 2016 13:14:50 +0100
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Subject: [calsify] Early AD review of draft-ietf-calext-extensions-02.txt
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In general the document is well written. I do have some comments which I 
would like to discuss before moving this document forward:

Please change "/=" to "/=" everywhere in ABNF fragments. Only the latter 
is valid according to RFC 5234.

5.6.  CATEGORIES Property

    Conformance:  This property can be specified multiple times in an
       iCalendar object.

Can you clarify handling of multiple instances of this property versa a 
single instance with multiple values in it? Are the values additive?

In 5.10: The ABNF doesn't seem to be correct:

>    image      = "IMAGE" imageparam ( ":" uri ) /
Which alternatives does "/" separate? I think you are missing an extra 
() somewhere here.
>                 (
>                   ";" "ENCODING" "=" "BASE64"
>                   ";" "VALUE" "=" "BINARY"
>                   ":" binary
>                 ) /
Extra "/" not needed?
>                 CRLF
>
>    imageparam = *(
>                  ;
>                  ; The following is REQUIRED,
>                  ; but MUST NOT occur more than once.
>                  ;
>                  (";" "VALUE" "=" "URI") /
>                  ;
>                  ; The following is OPTIONAL for a URI value,
>                  ; RECOMMENDED for a BINARY value,
>                  ; and MUST NOT occur more than once.
>                  ;
>                  (";" fmttypeparam) /
>                  ;
>                  ; The following are OPTIONAL,
>                  ; and MUST NOT occur more than once.
>                  ;
>                  (";" altrepparam) / (";" displayparam) /
fmttypeparam is listed only here and not for VALUE=BINARY. Your text in 
this section suggests that this parameter should apply to both alternatives.
>                  ;
>                  ; The following is OPTIONAL,
>                  ; and MAY occur more than once.
>                  ;
>                  (";" other-param)
>                  ;
>                  )

As per above, there are multiple errors above, so I am not sure about 
the desired syntax.

In 5.11: Please mention "https" URI, HTTPBIS is phasing out non TLS 
protected HTTP access.

In 6.1:

>    displayval =   ("BADGE" /    ; image inline with the title of the
>                                 ; event
>                    "GRAPHIC" /  ; a full image replacement for the event
>                                 ; itself
>                    "FULLSIZE
Missing terminating " above.
> /  ; an image that is used to enhance the
>                                 ; event
>                    "THUMBNAIL / ; a smaller variant of "FULLSIZE" to be
Missing terminating " here as well.
>                                 ; used when space for the image is
>                                 ; constrained
>                    x-name /     ; Experimental type
>                    iana-token)  ; Other IANA registered type
>                                 ;
>                                 ; Default is BADGE


From nobody Thu Jun  2 09:11:50 2016
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Date: Thu, 02 Jun 2016 12:11:38 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Alexey Melnikov <alexey.melnikov@isode.com>, calsify@ietf.org
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Hi Alexey,
Thanks for your review comments.

--On June 1, 2016 at 1:14:50 PM +0100 Alexey Melnikov 
<alexey.melnikov@isode.com> wrote:

> In general the document is well written. I do have some comments which I
> would like to discuss before moving this document forward:
>
> Please change "/=" to "/=" everywhere in ABNF fragments. Only the latter
> is valid according to RFC 5234.

Fixed.

> 5.6.  CATEGORIES Property
>
>     Conformance:  This property can be specified multiple times in an
>        iCalendar object.
>
> Can you clarify handling of multiple instances of this property versa a
> single instance with multiple values in it? Are the values additive?

Fixed by adding the following:

   Description:  When multiple properties are present, the set of
      categories that apply to the iCalendar object are the union of all
      the categories listed in each property value.


> In 5.10: The ABNF doesn't seem to be correct:
>
>>    image      = "IMAGE" imageparam ( ":" uri ) /
> Which alternatives does "/" separate? I think you are missing an extra ()
> somewhere here.
>>                 (
>>                   ";" "ENCODING" "=" "BASE64"
>>                   ";" "VALUE" "=" "BINARY"
>>                   ":" binary
>>                 ) /
> Extra "/" not needed?

Fixed.

>>                 CRLF
>>
>>    imageparam = *(
>>                  ;
>>                  ; The following is REQUIRED,
>>                  ; but MUST NOT occur more than once.
>>                  ;
>>                  (";" "VALUE" "=" "URI") /
>>                  ;
>>                  ; The following is OPTIONAL for a URI value,
>>                  ; RECOMMENDED for a BINARY value,
>>                  ; and MUST NOT occur more than once.
>>                  ;
>>                  (";" fmttypeparam) /
>>                  ;
>>                  ; The following are OPTIONAL,
>>                  ; and MUST NOT occur more than once.
>>                  ;
>>                  (";" altrepparam) / (";" displayparam) /
> fmttypeparam is listed only here and not for VALUE=BINARY. Your text in
> this section suggests that this parameter should apply to both
> alternatives.

The ABNF here is trying to following the syntax used for ATTACH 
(<https://tools.ietf.org/html/rfc5545#section-3.8.1.1>). Now that I have 
properly examined ABNF's operator precedence I see that "Concatenation" 
takes precedence over "Alternative". So 5545s "a b /c" construct should 
have been "a (b /c)".

I will fix the grouping.

> In 5.11: Please mention "https" URI, HTTPBIS is phasing out non TLS
> protected HTTP access.

Fixed. I changed all the examples to use https: instead of http: too.

> In 6.1:
>
>>    displayval =   ("BADGE" /    ; image inline with the title of the
>>                                 ; event
>>                    "GRAPHIC" /  ; a full image replacement for the event
>>                                 ; itself
>>                    "FULLSIZE
> Missing terminating " above.
>> /  ; an image that is used to enhance the
>>                                 ; event
>>                    "THUMBNAIL / ; a smaller variant of "FULLSIZE" to be
> Missing terminating " here as well.

Both fixed.

I will post an updated draft later today.

-- 
Cyrus Daboo


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--001a114dd8de8569e30533aca797
Content-Type: text/plain; charset=UTF-8

This draft standardizes a number of ad-hoc extensions for iCalendar, which
have long been requested by vendors and publishers. I support this moving
forward in its current form.

On Tue, May 24, 2016 at 12:51 PM, <internet-drafts@ietf.org> wrote:

>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Calendaring Extensions of the IETF.
>
>         Title           : New Properties for iCalendar
>         Author          : Cyrus Daboo
>         Filename        : draft-ietf-calext-extensions-02.txt
>         Pages           : 22
>         Date            : 2016-05-24
>
> Abstract:
>    This document defines a set of new properties for iCalendar data as
>    well as extending the use of some existing properties to the entire
>    iCalendar object.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-calext-extensions-02
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-calext-extensions-02
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> calsify mailing list
> calsify@ietf.org
> https://www.ietf.org/mailman/listinfo/calsify
>

--001a114dd8de8569e30533aca797
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>This draft standardizes a number of ad-hoc extensions=
 for iCalendar, which have long been requested by vendors and publishers. I=
 support this moving forward in its current form.</div></div><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote">On Tue, May 24, 2016 at 12:51 P=
M,  <span dir=3D"ltr">&lt;<a href=3D"mailto:internet-drafts@ietf.org" targe=
t=3D"_blank">internet-drafts@ietf.org</a>&gt;</span> wrote:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Calendaring Extensions of the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 New Properties for iCalendar<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Author=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : Cyru=
s Daboo<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-calext-extensions-02.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 22<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2016-05-24<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document defines a set of new properties for iCalendar da=
ta as<br>
=C2=A0 =C2=A0well as extending the use of some existing properties to the e=
ntire<br>
=C2=A0 =C2=A0iCalendar object.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/" =
rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/draft=
-ietf-calext-extensions/</a><br>
<br>
There&#39;s also a htmlized version available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-calext-extensions-02" rel=
=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/draft-ietf-ca=
lext-extensions-02</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-calext-extensions=
-02" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=
=3Ddraft-ietf-calext-extensions-02</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"noreferrer" target=
=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
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--001a114dd8de8569e30533aca797--


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Calendaring Extensions of the IETF.

        Title           : New Properties for iCalendar
        Author          : Cyrus Daboo
	Filename        : draft-ietf-calext-extensions-03.txt
	Pages           : 22
	Date            : 2016-06-04

Abstract:
   This document defines a set of new properties for iCalendar data as
   well as extending the use of some existing properties to the entire
   iCalendar object.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-calext-extensions-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-calext-extensions-03


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Sun Jun  5 03:45:34 2016
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Subject: Re: [calsify] I-D Action: draft-ietf-calext-extensions-03.txt
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On 04/06/2016 13:42, internet-drafts@ietf.org wrote:
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts directo=
ries.
> This draft is a work item of the Calendaring Extensions of the IETF.
>=20
>         Title           : New Properties for iCalendar
>         Author          : Cyrus Daboo
> 	Filename        : draft-ietf-calext-extensions-03.txt
> 	Pages           : 22
> 	Date            : 2016-06-04
>=20
> Abstract:
>    This document defines a set of new properties for iCalendar data as
>    well as extending the use of some existing properties to the entire
>    iCalendar object.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/
>=20
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-calext-extensions-03
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-calext-extensions-03

This version addressed my earlier concerns, thank you!


From nobody Mon Jun  6 08:35:40 2016
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To: Calsify <calsify@ietf.org>
From: Philipp Kewisch <mozilla@kewis.ch>
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Hello Cyrus,

I was reviewing said document in my function as the document shepherd
and have come across an issue I would appreciate clarification for.

In section 8.3 and 8.4 you are defining new property parameters. From
the introductory wording it first sounds like you are creating new
registries, but then you reference a template in RFC5545. Could you
change the wording to make clear if you are actually creating a new
registry as part of this document, or if you are making use of the
registries defined in RFC5545?

Kind Regards,
Philipp


From nobody Mon Jun  6 09:08:04 2016
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Cyrus,

I found a minor issue in the latest draft. Looks like the CONFERENCE
property is missing in the updated ABNF in section 4
(https://tools.ietf.org/html/draft-ietf-calext-extensions-03#section-4)

Also, how do the new properties relate to CalDAV?
Is it valid if a CalDAV client adds a SOURCE and/or UID property to a
VCALENDAR object before uploading it to a CalDAV server (e.g. to store
the origin if the event was imported from a webcal feed)?
And are servers supposed to store and return these values?

How does the CATEGORIES property on VCALENDAR objects relate to the
CATEGORIES property on VEVENT or VTODO objects? Does a VEVENT inherit
the CATEGORIES of the enclosing VCALENDAR object or are they completely
unrelated? If the CATEGORIES are inherited, what happens with CATEGORIES
specified on the VEVENT, do they override or extend the inherited
CATEGORIES?

Cheers,

Marten


Am 04.06.2016 um 14:42 schrieb internet-drafts@ietf.org:
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Calendaring Extensions of the IETF.
>
>         Title           : New Properties for iCalendar
>         Author          : Cyrus Daboo
> 	Filename        : draft-ietf-calext-extensions-03.txt
> 	Pages           : 22
> 	Date            : 2016-06-04
>
> Abstract:
>    This document defines a set of new properties for iCalendar data as
>    well as extending the use of some existing properties to the entire
>    iCalendar object.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-calext-extensions-03
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-calext-extensions-03
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> calsify mailing list
> calsify@ietf.org
> https://www.ietf.org/mailman/listinfo/calsify

-- 
Marten Gajda
CEO

dmfs GmbH
Schandauer StraƟe 34
01309 Dresden
GERMANY

phone: +49 177 4427167
email: marten@dmfs.org

Managing Director: Marten Gajda
Registered address: Dresden
Registered No.: AG Dresden HRB 34881
VAT Reg. No.: DE303248743


From nobody Mon Jun  6 12:48:35 2016
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From: Daniel Migault <daniel.migault@ericsson.com>
To: Daboo Cyrus <cyrus@daboo.name>, "calsify@ietf.org" <calsify@ietf.org>
Thread-Topic: draft-ietf-calext-availability-02
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Hi Cyrus,

I reviewed the document  draft-ietf-calext-availability, and here are my co=
mments. Please let me know if you think that some clarification can be adde=
d.

BR,
Daniel

Section 4 Combining VAVAILABILITY components

"""
It is up o the creator of such components to ensure that combining them pro=
duces a consistent and expected result.
"""
I am not sure it makes a lot of sense here, but I would like to know if tha=
t would be possible to provide some recommendations for the priority to set=
 for the default VAVAILABILITY. For example, when I say I am available Mond=
ay - Friday 9:00 5:00 pm is it recommended I set a priority of 0, 9, ..7 --=
 of course not 1. ;-) My point is that it is easy to understand why not 1, =
it is less obvious whether setting tool low priority level would not leave =
to similar issues.


Section 5 Calculating Free-Busy Time

Item 2:
"""
For each "VAVAILABILITY" component ordered by PRIORITY
"""
I guess the priority order is from highest to lowest PRIORITY. Shouldn't we=
 mention is explicitly for clarity?

Item 3:
"""
For each remaining "VAVAILABILITY" component in order:
"""

I am not very clear of what "in order means". Do you mean ordered by priori=
ty  as in item 2? My understanding is that the VAVAILABILITY components are=
 those of step Item 2.3 "For the time...". If I am correct don't you think =
we could explicitly mention it?





[Ericsson]<http://www.ericsson.com/>

DANIEL MIGAULT
Researcher
Research

Ericsson
8500 Boulevard Decarie
H4P 2N2 Montreal, Canada
Phone +1 514 345 7900 46628
Mobile +1 514 452 2160
daniel.migault@ericsson.com
www.ericsson.com


[http://www.ericsson.com/current_campaign]<http://www.ericsson.com/current_=
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Legal entity: Ericsson Canada Inc., registered office in Montreal. This Com=
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<p class=3D"MsoNormal">Hi Cyrus, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I reviewed the document &nbsp;draft-ietf-calext-avai=
lability, and here are my comments. Please let me know if you think that so=
me clarification can be added.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">BR, <br>
Daniel<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 4 Combining VAVAILABILITY components<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<o:p></o:p></p>
<p class=3D"MsoNormal">It is up o the creator of such components to ensure =
that combining them produces a consistent and expected result.<o:p></o:p></=
p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<o:p></o:p></p>
<p class=3D"MsoNormal">I am not sure it makes a lot of sense here, but I wo=
uld like to know if that would be possible to provide some recommendations =
for the priority to set for the default VAVAILABILITY. For example, when I =
say I am available Monday - Friday
 9:00 5:00 pm is it recommended I set a priority of 0, 9, ..7 -- of course =
not 1. ;-) My point is that it is easy to understand why not 1, it is less =
obvious whether setting tool low priority level would not leave to similar =
issues.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5 Calculating Free-Busy Time<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Item 2: <o:p></o:p></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<o:p></o:p></p>
<p class=3D"MsoNormal">For each &quot;VAVAILABILITY&quot; component ordered=
 by PRIORITY<o:p></o:p></p>
<p class=3D"MsoNormal">&quot;&quot;&quot; <o:p></o:p></p>
<p class=3D"MsoNormal">I guess the priority order is from highest to lowest=
 PRIORITY. Shouldn't we mention is explicitly for clarity?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Item 3:<o:p></o:p></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<o:p></o:p></p>
<p class=3D"MsoNormal">For each remaining &quot;VAVAILABILITY&quot; compone=
nt in order:<o:p></o:p></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I am not very clear of what &quot;in order means&quo=
t;. Do you mean ordered by priority&nbsp; as in item 2? My understanding is=
 that the VAVAILABILITY components are those of step Item 2.3 &quot;For the=
 time...&quot;. If I am correct don't you think we could explicitly
 mention it?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp; <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><a href=3D"http://www=
.ericsson.com/" target=3D"_blank"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Arial&quot;,&quot;sans-serif&quot;;color:blue;text-decoration:none=
"><img border=3D"0" width=3D"68" height=3D"60" id=3D"_x0000_i1026" src=3D"c=
id:image001.gif@01D1C00A.DE2A86F0" alt=3D"Ericsson"></span></a><span style=
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<br>
<br>
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
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<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;;color:#333333">DANIEL MIGAULT
</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&q=
uot;sans-serif&quot;;color:#333333"><br>
Researcher <br>
Research</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New =
Roman&quot;,&quot;serif&quot;;color:#333333"><o:p></o:p></span></p>
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</span><b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&qu=
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33"><br>
8500 Boulevard Decarie<br>
H4P 2N2 Montreal, Canada<br>
Phone &#43;1 514 345 7900 46628<br>
Mobile &#43;1 514 452 2160<br>
daniel.migault@ericsson.com<br>
www.ericsson.com </span><span style=3D"font-size:12.0pt;font-family:&quot;T=
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--_005_2DD56D786E600F45AC6BDE7DA4E8A8C117F0D797eusaamb108erics_--


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From: Daniel Migault <daniel.migault@ericsson.com>
Date: Tue, 7 Jun 2016 13:28:45 -0400
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To: Daboo Cyrus <cyrus@daboo.name>, "calsify@ietf.org" <calsify@ietf.org>
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Subject: Re: [calsify] draft-ietf-calext-availability-02
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Hi,

In order to pass the ABNF check, I would suggest to replace:

OLD:
                 ; the following are OPTIONAL,
                 ; and MAY occur more than once
                 ;
                 categories / comment / contact / exdate /
                 rdate / x-prop / iana-prop

                 )

NEW:
                 ; the following are OPTIONAL,
                 ; and MAY occur more than once
                 ;
                 categories / comment / contact / exdate /
                 rdate / x-prop / iana-prop
                 ;
                 )



On Mon, Jun 6, 2016 at 3:48 PM, Daniel Migault <daniel.migault@ericsson.com>
wrote:

> Hi Cyrus,
>
>
>
> I reviewed the document  draft-ietf-calext-availability, and here are my
> comments. Please let me know if you think that some clarification can be
> added.
>
>
>
> BR,
> Daniel
>
>
>
> Section 4 Combining VAVAILABILITY components
>
>
>
> """
>
> It is up o the creator of such components to ensure that combining them
> produces a consistent and expected result.
>
> """
>
> I am not sure it makes a lot of sense here, but I would like to know if
> that would be possible to provide some recommendations for the priority to
> set for the default VAVAILABILITY. For example, when I say I am available
> Monday - Friday 9:00 5:00 pm is it recommended I set a priority of 0, 9,
> ..7 -- of course not 1. ;-) My point is that it is easy to understand why
> not 1, it is less obvious whether setting tool low priority level would not
> leave to similar issues.
>
>
>
>
>
> Section 5 Calculating Free-Busy Time
>
>
>
> Item 2:
>
> """
>
> For each "VAVAILABILITY" component ordered by PRIORITY
>
> """
>
> I guess the priority order is from highest to lowest PRIORITY. Shouldn't
> we mention is explicitly for clarity?
>
>
>
> Item 3:
>
> """
>
> For each remaining "VAVAILABILITY" component in order:
>
> """
>
>
>
> I am not very clear of what "in order means". Do you mean ordered by
> priority  as in item 2? My understanding is that the VAVAILABILITY
> components are those of step Item 2.3 "For the time...". If I am correct
> don't you think we could explicitly mention it?
>
>
>
>
>
>
>
>
>
>
>
> [image: Ericsson] <http://www.ericsson.com/>
>
> *DANIEL MIGAULT *
> Researcher
> Research
>
>
> *Ericsson*
> 8500 Boulevard Decarie
> H4P 2N2 Montreal, Canada
> Phone +1 514 345 7900 46628
> Mobile +1 514 452 2160
> daniel.migault@ericsson.com
> www.ericsson.com
>
>
>
> [image: http://www.ericsson.com/current_campaign]
> <http://www.ericsson.com/current_campaign>
>
>
>
> Legal entity: Ericsson Canada Inc., registered office in Montreal. This
> Communication is Confidential. We only send and receive email on the basis
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>
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<div dir=3D"ltr"><div><div><div>Hi, <br><br></div>In order to pass the ABNF=
 check, I would suggest to replace:<br><br></div>OLD:<br>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 ; the following are OPTIONAL,<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ; and MAY occu=
r more than once<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 categ=
ories / comment / contact / exdate /<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 rdate / x-p=
rop / iana-prop<br><br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 )<br><br></div>NEW:<br>=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 ; the following are OPTIONAL,<br>=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ; =
and MAY occur more than once<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ;<br>=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 categories / comment / contact / exdate /<br>=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 rdate / x-prop / iana-prop<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ;<br>=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 )<br><br><div><br></div></div><div class=3D"gmail_extra"><br><div cl=
ass=3D"gmail_quote">On Mon, Jun 6, 2016 at 3:48 PM, Daniel Migault <span di=
r=3D"ltr">&lt;<a href=3D"mailto:daniel.migault@ericsson.com" target=3D"_bla=
nk">daniel.migault@ericsson.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">





<div link=3D"blue" vlink=3D"purple" lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Hi Cyrus, <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I reviewed the document =C2=A0draft-ietf-calext-avai=
lability, and here are my comments. Please let me know if you think that so=
me clarification can be added.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">BR, <br>
Daniel<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Section 4 Combining VAVAILABILITY components<u></u><=
u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<u></u><u></u></p>
<p class=3D"MsoNormal">It is up o the creator of such components to ensure =
that combining them produces a consistent and expected result.<u></u><u></u=
></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<u></u><u></u></p>
<p class=3D"MsoNormal">I am not sure it makes a lot of sense here, but I wo=
uld like to know if that would be possible to provide some recommendations =
for the priority to set for the default VAVAILABILITY. For example, when I =
say I am available Monday - Friday
 9:00 5:00 pm is it recommended I set a priority of 0, 9, ..7 -- of course =
not 1. ;-) My point is that it is easy to understand why not 1, it is less =
obvious whether setting tool low priority level would not leave to similar =
issues.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Section 5 Calculating Free-Busy Time<u></u><u></u></=
p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Item 2: <u></u><u></u></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<u></u><u></u></p>
<p class=3D"MsoNormal">For each &quot;VAVAILABILITY&quot; component ordered=
 by PRIORITY<u></u><u></u></p>
<p class=3D"MsoNormal">&quot;&quot;&quot; <u></u><u></u></p>
<p class=3D"MsoNormal">I guess the priority order is from highest to lowest=
 PRIORITY. Shouldn&#39;t we mention is explicitly for clarity?<u></u><u></u=
></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Item 3:<u></u><u></u></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<u></u><u></u></p>
<p class=3D"MsoNormal">For each remaining &quot;VAVAILABILITY&quot; compone=
nt in order:<u></u><u></u></p>
<p class=3D"MsoNormal">&quot;&quot;&quot;<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I am not very clear of what &quot;in order means&quo=
t;. Do you mean ordered by priority=C2=A0 as in item 2? My understanding is=
 that the VAVAILABILITY components are those of step Item 2.3 &quot;For the=
 time...&quot;. If I am correct don&#39;t you think we could explicitly
 mention it?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0 <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><a href=3D"http://www=
.ericsson.com/" target=3D"_blank"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Arial&quot;,&quot;sans-serif&quot;;color:blue;text-decoration:none=
"><img src=3D"cid:image001.gif@01D1C00A.DE2A86F0" alt=3D"Ericsson" border=
=3D"0" height=3D"60" width=3D"68"></span></a><span style=3D"font-size:10.0p=
t;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><br>
<br>
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;;color:#333333">DANIEL MIGAULT
</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&q=
uot;sans-serif&quot;;color:#333333"><br>
Researcher <br>
Research</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New =
Roman&quot;,&quot;serif&quot;;color:#333333"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;;color:#333333"><br>
</span><b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&qu=
ot;sans-serif&quot;;color:#333333">Ericsson</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#3333=
33"><br>
8500 Boulevard Decarie<br>
H4P 2N2 Montreal, Canada<br>
Phone +1 514 345 7900 46628<br>
Mobile <a href=3D"tel:%2B1%20514%20452%202160" value=3D"+15144522160" targe=
t=3D"_blank">+1 514 452 2160</a><br>
<a href=3D"mailto:daniel.migault@ericsson.com" target=3D"_blank">daniel.mig=
ault@ericsson.com</a><br>
<a href=3D"http://www.ericsson.com" target=3D"_blank">www.ericsson.com</a> =
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;;color:#333333"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Ari=
al&quot;,&quot;sans-serif&quot;"><br>
<br>
</span><a href=3D"http://www.ericsson.com/current_campaign" target=3D"_blan=
k"><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,&quot;sans-=
serif&quot;;color:blue;text-decoration:none"><img src=3D"cid:image002.gif@0=
1D1C00A.DE2A86F0" alt=3D"http://www.ericsson.com/current_campaign" border=
=3D"0" height=3D"80" width=3D"500"></span></a><span style=3D"font-size:12.0=
pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:8.0pt;font-family:&quot;Ari=
al&quot;,&quot;sans-serif&quot;;color:#333333">Legal entity: Ericsson Canad=
a Inc., registered office in Montreal. This Communication is Confidential. =
We only send and receive email on the basis of the terms
 set out at <a href=3D"http://www.ericsson.com/email_disclaimer" title=3D"h=
ttp://www.ericsson.com/email_disclaimer" target=3D"_blank">
<span style=3D"color:blue">www.ericsson.com/email_disclaimer</span></a> </s=
pan><u></u><u></u></p>
</div>
</div>

<br>_______________________________________________<br>
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" target=3D"_blank">https://www.ietf.org/mailman/listinfo/calsify</a><br>
<br></blockquote></div><br></div>

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From nobody Wed Jun  8 07:53:54 2016
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Cc: draft-ietf-calext-extensions@ietf.org, calext-chairs@ietf.org, mozilla@kewis.ch, calsify@ietf.org
Subject: [calsify] Last Call: <draft-ietf-calext-extensions-03.txt> (New Properties for iCalendar) to Proposed Standard
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The IESG has received a request from the Calendaring Extensions WG
(calext) to consider the following document:
- 'New Properties for iCalendar'
  <draft-ietf-calext-extensions-03.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2016-06-22. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   This document defines a set of new properties for iCalendar data as
   well as extending the use of some existing properties to the entire
   iCalendar object.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/ballot/


No IPR declarations have been submitted directly on this I-D.



From nobody Thu Jun  9 02:07:09 2016
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To: calsify@ietf.org
From: Alexey Melnikov <alexey.melnikov@isode.com>
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Date: Thu, 9 Jun 2016 10:06:41 +0100
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Subject: [calsify] AD review of draft-ietf-calext-availability-02.txt
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Hi,
I think the document is in a good shape. In addition to minor points 
raised by the document shepherd, I have one small nit:

3.1.  VAVAILABILITY Component

    availabilityprop  = *(
                     ;
                     ; the following are REQUIRED,
                     ; but MUST NOT occur more than once
                     ;
                     dtstamp / uid
                     ;
                     ; the following are OPTIONAL,
                     ; but MUST NOT occur more than once
                     ;
                     busytype / class / created / description /

But draft-ietf-calext-extensions-03, Section 5.3 says:

    Conformance:  This property can be specified multiple times in an
       iCalendar object.  However, each property MUST represent the
       description of the calendar in a different language.


                     dtstart / last-mod / location / organizer /
                     priority /seq / summary / url /



Similarly:

    availableprop  = *(
                  ;
                  ; the following are REQUIRED,
                  ; but MUST NOT occur more than once
                  ;
                  dtstamp / dtstart / uid /
                  ;
                  ; Either 'dtend' or 'duration' MAY appear in
                  ; an 'availableprop', but 'dtend' and
                  ; 'duration' MUST NOT occur in the same
                  ; 'availableprop'.
                  ;
                  dtend / duration /

                  ;
                  ; the following are OPTIONAL,
                  ; but MUST NOT occur more than once
                  ;
                  created / description / last-mod /

the comment for description is not correct.

                  location / recurid / rrule / summary /

Otherwise the document looks good to me.

Best Regards,
Alexey


From nobody Thu Jun  9 07:45:19 2016
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Date: Thu, 09 Jun 2016 07:45:12 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Alexey Melnikov <alexey.melnikov@isode.com>, calsify@ietf.org
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Subject: Re: [calsify] AD review of draft-ietf-calext-availability-02.txt
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Hi Alexey,

--On June 9, 2016 at 10:06:41 AM +0100 Alexey Melnikov 
<alexey.melnikov@isode.com> wrote:

> I think the document is in a good shape. In addition to minor points
> raised by the document shepherd, I have one small nit:

OK, thanks for your review, and to Daniel for his. I also have comments 
from Bernard as the iCalendar registry expert to address as well. I am 
working out of town this week and won't have a chance to address the 
reviews until I am back, but hopefully should do so early next week.

-- 
Cyrus Daboo


From nobody Wed Jun 22 07:39:16 2016
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From: Cyrus Daboo <cyrus@daboo.name>
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Subject: Re: [calsify] AD review of draft-ietf-calext-availability-02.txt
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Hi Alexey,

--On June 9, 2016 at 10:06:41 AM +0100 Alexey Melnikov 
<alexey.melnikov@isode.com> wrote:

> 3.1.  VAVAILABILITY Component
>
>     availabilityprop  = *(
>                      ;
>                      ; the following are REQUIRED,
>                      ; but MUST NOT occur more than once
>                      ;
>                      dtstamp / uid
>                      ;
>                      ; the following are OPTIONAL,
>                      ; but MUST NOT occur more than once
>                      ;
>                      busytype / class / created / description /
>
> But draft-ietf-calext-extensions-03, Section 5.3 says:
>
>     Conformance:  This property can be specified multiple times in an
>        iCalendar object.  However, each property MUST represent the
>        description of the calendar in a different language.

OK, so the issue here is that 5545 states that the DESCRIPTION propertycan 
only be present once in VEVENT, VTODO, etc, and the availability spec does 
the same via the ABNF comment. However, draft-ietf-calext-extensions-03 
extends the use of DESCRIPTION to the VCALENDAR item ("iCalendar object") 
as an optional, but multiply occurring item - with each occurrence 
representing a potentially different language representation.

At this point I propose changing draft-ietf-calext-extensions-03 to 
restrict DESCRIPTION to be "OPTIONAL, MUST NOT occur more than once" to 
match its behavior elsewhere. For multiple language support we should 
instead to be looking at using STYLED-DESCRIPTION as defined in 
<https://tools.ietf.org/html/draft-douglass-calendar-extension-05#section-5.2>, 
a draft I am hoping this WG will eventually adopt.

Obviously this is a change to draft-ietf-calext-extensions-03 after it has 
gone through WGLC - so we will need to process it accordingly.

-- 
Cyrus Daboo


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Date: Wed, 22 Jun 2016 11:55:00 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Daniel Migault <daniel.migault@ericsson.com>, calsify@ietf.org
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Subject: Re: [calsify] draft-ietf-calext-availability-02
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Hi Daniel,
Thanks for your review. Sorry I have not been able to address your comments 
until now. All changes described below have been made to my working copy 
and will be published in a new draft once I have addressed comments from 
other reviewers.


--On June 6, 2016 at 7:48:28 PM +0000 Daniel Migault 
<daniel.migault@ericsson.com> wrote:

> Section 4 Combining VAVAILABILITY components
>
> """
> It is up o the creator of such components to ensure that combining them
> produces a consistent and expected result. """
> I am not sure it makes a lot of sense here, but I would like to know if
> that would be possible to provide some recommendations for the priority
> to set for the default VAVAILABILITY. For example, when I say I am
> available Monday - Friday 9:00 5:00 pm is it recommended I set a priority
> of 0, 9, ..7 -- of course not 1. ;-) My point is that it is easy to
> understand why not 1, it is less obvious whether setting tool low
> priority level would not leave to similar issues.

I think it is reasonable to recommend that a user's "default" availability 
should have PRIORITY:0 (or absence of PRIORITY property). Here is new text 
I have added:

    Typically, a calendar user's "default" availability (e.g., business
    hours of Monday through Friday, 9:00 am to 5:00 pm) would use the
    lowest level of priority: zero. Any overrides to the "default" would
    use higher levels as needed. To avoid having to keep readjusting the
    "PRIORITY" property value when an override has to be "inserted" between
    two existing components, priority values SHOULD be "spaced out" over
    the full range of values. e.g., the "default" availability is created
    with priority zero, then the first override created with priority 5, a
    subsequent availability can be inserted between the two by using
    priority 7, and another, taking precedence over all existing ones, with
    priority 3.

>
> Section 5 Calculating Free-Busy Time
>
> Item 2:
> """
> For each "VAVAILABILITY" component ordered by PRIORITY
> """
> I guess the priority order is from highest to lowest PRIORITY. Shouldn't
> we mention is explicitly for clarity?

Bernard suggested that too, and I have added text to clarify that. However, 
the correct way is to order and process them from lowest to highest, so 
that you can "layer" the higher priority items over the lower ones.OK,

> Item 3:
> """
> For each remaining "VAVAILABILITY" component in order:
> """
>
> I am not very clear of what "in order means". Do you mean ordered by
> priority  as in item 2? My understanding is that the VAVAILABILITY
> components are those of step Item 2.3 "For the time...". If I am correct
> don't you think we could explicitly mention it?
>

To clarify this I have added a new item 2 (d):

    d. Append the "VAVAILABILITY" component to a list of components for
    further processing in step 3, if it has not been ignored.

and adjusted the text to item 3 to:

    3. For each "VAVAILABILITY" component in the list resulting from step 2,
    in order from the first item to the last item:

I think that clarifies the proper order for the steps in 3.

-- 
Cyrus Daboo


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Date: Wed, 22 Jun 2016 11:58:08 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Daniel Migault <daniel.migault@ericsson.com>, calsify@ietf.org
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Hi Daniel,

--On June 7, 2016 at 1:28:45 PM -0400 Daniel Migault 
<daniel.migault@ericsson.com> wrote:

> In order to pass the ABNF check, I would suggest to replace:
>
> OLD:
>                  ; the following are OPTIONAL,
>                  ; and MAY occur more than once
>                  ;
>                  categories / comment / contact / exdate /
>                  rdate / x-prop / iana-prop
>
>                  )
>
> NEW:
>                  ; the following are OPTIONAL,
>                  ; and MAY occur more than once
>                  ;
>                  categories / comment / contact / exdate /
>                  rdate / x-prop / iana-prop
>                  ;
>                  )

Fixed.

-- 
Cyrus Daboo


From nobody Wed Jun 22 09:20:32 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Calendaring Extensions of the IETF.

        Title           : Calendar Availability
        Authors         : Cyrus Daboo
                          Michael Douglass
	Filename        : draft-ietf-calext-availability-03.txt
	Pages           : 24
	Date            : 2016-06-22

Abstract:
   This document specifies a new iCalendar calendar component that
   allows the publication of available and unavailable time periods
   associated with a calendar user.  This component can be used in
   standard iCalendar free-busy lookups, including iTIP free-busy
   requests, to generate repeating blocks of available or busy time with
   exceptions as needed.

   This document also defines extensions to CalDAV calendar-access and
   calendar-auto-schedule which specify how this new calendar component
   can be used when doing free-busy time evaluation in CalDAV.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-calext-availability/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-calext-availability-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-calext-availability-03


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Thu Jun 23 07:15:18 2016
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Subject: [calsify] Last Call: <draft-ietf-calext-availability-03.txt> (Calendar Availability) to Proposed Standard
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The IESG has received a request from the Calendaring Extensions WG
(calext) to consider the following document:
- 'Calendar Availability'
  <draft-ietf-calext-availability-03.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2016-07-07. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   This document specifies a new iCalendar calendar component that
   allows the publication of available and unavailable time periods
   associated with a calendar user.  This component can be used in
   standard iCalendar free-busy lookups, including iTIP free-busy
   requests, to generate repeating blocks of available or busy time with
   exceptions as needed.

   This document also defines extensions to CalDAV calendar-access and
   calendar-auto-schedule which specify how this new calendar component
   can be used when doing free-busy time evaluation in CalDAV.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-calext-availability/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-calext-availability/ballot/


No IPR declarations have been submitted directly on this I-D.



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From: Daniel Migault <daniel.migault@ericsson.com>
Date: Thu, 23 Jun 2016 09:38:35 -0500
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Subject: Re: [calsify] draft-ietf-calext-availability-02
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Thanks for addressing this issues.
BR,
Daniel

On Wed, Jun 22, 2016 at 10:58 AM, Cyrus Daboo <cyrus@daboo.name> wrote:

> Hi Daniel,
>
> --On June 7, 2016 at 1:28:45 PM -0400 Daniel Migault <
> daniel.migault@ericsson.com> wrote:
>
> In order to pass the ABNF check, I would suggest to replace:
>>
>> OLD:
>>                  ; the following are OPTIONAL,
>>                  ; and MAY occur more than once
>>                  ;
>>                  categories / comment / contact / exdate /
>>                  rdate / x-prop / iana-prop
>>
>>                  )
>>
>> NEW:
>>                  ; the following are OPTIONAL,
>>                  ; and MAY occur more than once
>>                  ;
>>                  categories / comment / contact / exdate /
>>                  rdate / x-prop / iana-prop
>>                  ;
>>                  )
>>
>
> Fixed.
>
> --
> Cyrus Daboo
>
>
> _______________________________________________
> calsify mailing list
> calsify@ietf.org
> https://www.ietf.org/mailman/listinfo/calsify
>

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<div dir=3D"ltr"><div><div>Thanks for addressing this issues.<br></div>BR, =
<br></div>Daniel<br></div><div class=3D"gmail_extra"><br><div class=3D"gmai=
l_quote">On Wed, Jun 22, 2016 at 10:58 AM, Cyrus Daboo <span dir=3D"ltr">&l=
t;<a href=3D"mailto:cyrus@daboo.name" target=3D"_blank">cyrus@daboo.name</a=
>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 =
0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Daniel,<span class=
=3D""><br>
<br>
--On June 7, 2016 at 1:28:45 PM -0400 Daniel Migault &lt;<a href=3D"mailto:=
daniel.migault@ericsson.com" target=3D"_blank">daniel.migault@ericsson.com<=
/a>&gt; wrote:<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
In order to pass the ABNF check, I would suggest to replace:<br>
<br>
OLD:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0; the followi=
ng are OPTIONAL,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0; and MAY occ=
ur more than once<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0categories / =
comment / contact / exdate /<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0rdate / x-pro=
p / iana-prop<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0)<br>
<br>
NEW:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0; the followi=
ng are OPTIONAL,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0; and MAY occ=
ur more than once<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0categories / =
comment / contact / exdate /<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0rdate / x-pro=
p / iana-prop<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0)<br>
</blockquote>
<br></span>
Fixed.<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
-- <br>
Cyrus Daboo</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
_______________________________________________<br>
calsify mailing list<br>
<a href=3D"mailto:calsify@ietf.org" target=3D"_blank">calsify@ietf.org</a><=
br>
<a href=3D"https://www.ietf.org/mailman/listinfo/calsify" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/mailman/listinfo/calsify</a><br>
</div></div></blockquote></div><br></div>

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From: Daniel Migault <daniel.migault@ericsson.com>
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Thanks for addressing this issues.
BR,
Daniel

On Wed, Jun 22, 2016 at 10:55 AM, Cyrus Daboo <cyrus@daboo.name> wrote:

> Hi Daniel,
> Thanks for your review. Sorry I have not been able to address your
> comments until now. All changes described below have been made to my
> working copy and will be published in a new draft once I have addressed
> comments from other reviewers.
>
>
> --On June 6, 2016 at 7:48:28 PM +0000 Daniel Migault <
> daniel.migault@ericsson.com> wrote:
>
> Section 4 Combining VAVAILABILITY components
>>
>> """
>> It is up o the creator of such components to ensure that combining them
>> produces a consistent and expected result. """
>> I am not sure it makes a lot of sense here, but I would like to know if
>> that would be possible to provide some recommendations for the priority
>> to set for the default VAVAILABILITY. For example, when I say I am
>> available Monday - Friday 9:00 5:00 pm is it recommended I set a priority
>> of 0, 9, ..7 -- of course not 1. ;-) My point is that it is easy to
>> understand why not 1, it is less obvious whether setting tool low
>> priority level would not leave to similar issues.
>>
>
> I think it is reasonable to recommend that a user's "default" availability
> should have PRIORITY:0 (or absence of PRIORITY property). Here is new text
> I have added:
>
>    Typically, a calendar user's "default" availability (e.g., business
>    hours of Monday through Friday, 9:00 am to 5:00 pm) would use the
>    lowest level of priority: zero. Any overrides to the "default" would
>    use higher levels as needed. To avoid having to keep readjusting the
>    "PRIORITY" property value when an override has to be "inserted" between
>    two existing components, priority values SHOULD be "spaced out" over
>    the full range of values. e.g., the "default" availability is created
>    with priority zero, then the first override created with priority 5, a
>    subsequent availability can be inserted between the two by using
>    priority 7, and another, taking precedence over all existing ones, with
>    priority 3.
>
>
>> Section 5 Calculating Free-Busy Time
>>
>> Item 2:
>> """
>> For each "VAVAILABILITY" component ordered by PRIORITY
>> """
>> I guess the priority order is from highest to lowest PRIORITY. Shouldn't
>> we mention is explicitly for clarity?
>>
>
> Bernard suggested that too, and I have added text to clarify that.
> However, the correct way is to order and process them from lowest to
> highest, so that you can "layer" the higher priority items over the lower
> ones.OK,
>
> Item 3:
>> """
>> For each remaining "VAVAILABILITY" component in order:
>> """
>>
>> I am not very clear of what "in order means". Do you mean ordered by
>> priority  as in item 2? My understanding is that the VAVAILABILITY
>> components are those of step Item 2.3 "For the time...". If I am correct
>> don't you think we could explicitly mention it?
>>
>>
> To clarify this I have added a new item 2 (d):
>
>    d. Append the "VAVAILABILITY" component to a list of components for
>    further processing in step 3, if it has not been ignored.
>
> and adjusted the text to item 3 to:
>
>    3. For each "VAVAILABILITY" component in the list resulting from step 2,
>    in order from the first item to the last item:
>
> I think that clarifies the proper order for the steps in 3.
>
> --
> Cyrus Daboo
>
>
> _______________________________________________
> calsify mailing list
> calsify@ietf.org
> https://www.ietf.org/mailman/listinfo/calsify
>

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<div dir=3D"ltr"><div><div>Thanks for addressing this issues.<br></div>BR, =
<br></div>Daniel</div><div class=3D"gmail_extra"><br><div class=3D"gmail_qu=
ote">On Wed, Jun 22, 2016 at 10:55 AM, Cyrus Daboo <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:cyrus@daboo.name" target=3D"_blank">cyrus@daboo.name</a>&gt=
;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Daniel,<br>
Thanks for your review. Sorry I have not been able to address your comments=
 until now. All changes described below have been made to my working copy a=
nd will be published in a new draft once I have addressed comments from oth=
er reviewers.<span class=3D""><br>
<br>
<br>
--On June 6, 2016 at 7:48:28 PM +0000 Daniel Migault &lt;<a href=3D"mailto:=
daniel.migault@ericsson.com" target=3D"_blank">daniel.migault@ericsson.com<=
/a>&gt; wrote:<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Section 4 Combining VAVAILABILITY components<br>
<br>
&quot;&quot;&quot;<br>
It is up o the creator of such components to ensure that combining them<br>
produces a consistent and expected result. &quot;&quot;&quot;<br>
I am not sure it makes a lot of sense here, but I would like to know if<br>
that would be possible to provide some recommendations for the priority<br>
to set for the default VAVAILABILITY. For example, when I say I am<br>
available Monday - Friday 9:00 5:00 pm is it recommended I set a priority<b=
r>
of 0, 9, ..7 -- of course not 1. ;-) My point is that it is easy to<br>
understand why not 1, it is less obvious whether setting tool low<br>
priority level would not leave to similar issues.<br>
</blockquote>
<br></span>
I think it is reasonable to recommend that a user&#39;s &quot;default&quot;=
 availability should have PRIORITY:0 (or absence of PRIORITY property). Her=
e is new text I have added:<br>
<br>
=C2=A0 =C2=A0Typically, a calendar user&#39;s &quot;default&quot; availabil=
ity (e.g., business<br>
=C2=A0 =C2=A0hours of Monday through Friday, 9:00 am to 5:00 pm) would use =
the<br>
=C2=A0 =C2=A0lowest level of priority: zero. Any overrides to the &quot;def=
ault&quot; would<br>
=C2=A0 =C2=A0use higher levels as needed. To avoid having to keep readjusti=
ng the<br>
=C2=A0 =C2=A0&quot;PRIORITY&quot; property value when an override has to be=
 &quot;inserted&quot; between<br>
=C2=A0 =C2=A0two existing components, priority values SHOULD be &quot;space=
d out&quot; over<br>
=C2=A0 =C2=A0the full range of values. e.g., the &quot;default&quot; availa=
bility is created<br>
=C2=A0 =C2=A0with priority zero, then the first override created with prior=
ity 5, a<br>
=C2=A0 =C2=A0subsequent availability can be inserted between the two by usi=
ng<br>
=C2=A0 =C2=A0priority 7, and another, taking precedence over all existing o=
nes, with<br>
=C2=A0 =C2=A0priority 3.<span class=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
Section 5 Calculating Free-Busy Time<br>
<br>
Item 2:<br>
&quot;&quot;&quot;<br>
For each &quot;VAVAILABILITY&quot; component ordered by PRIORITY<br>
&quot;&quot;&quot;<br>
I guess the priority order is from highest to lowest PRIORITY. Shouldn&#39;=
t<br>
we mention is explicitly for clarity?<br>
</blockquote>
<br></span>
Bernard suggested that too, and I have added text to clarify that. However,=
 the correct way is to order and process them from lowest to highest, so th=
at you can &quot;layer&quot; the higher priority items over the lower ones.=
OK,<span class=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Item 3:<br>
&quot;&quot;&quot;<br>
For each remaining &quot;VAVAILABILITY&quot; component in order:<br>
&quot;&quot;&quot;<br>
<br>
I am not very clear of what &quot;in order means&quot;. Do you mean ordered=
 by<br>
priority=C2=A0 as in item 2? My understanding is that the VAVAILABILITY<br>
components are those of step Item 2.3 &quot;For the time...&quot;. If I am =
correct<br>
don&#39;t you think we could explicitly mention it?<br>
<br>
</blockquote>
<br></span>
To clarify this I have added a new item 2 (d):<br>
<br>
=C2=A0 =C2=A0d. Append the &quot;VAVAILABILITY&quot; component to a list of=
 components for<br>
=C2=A0 =C2=A0further processing in step 3, if it has not been ignored.<br>
<br>
and adjusted the text to item 3 to:<br>
<br>
=C2=A0 =C2=A03. For each &quot;VAVAILABILITY&quot; component in the list re=
sulting from step 2,<br>
=C2=A0 =C2=A0in order from the first item to the last item:<br>
<br>
I think that clarifies the proper order for the steps in 3.<span class=3D"H=
OEnZb"><font color=3D"#888888"><br>
<br>
-- <br>
Cyrus Daboo</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
_______________________________________________<br>
calsify mailing list<br>
<a href=3D"mailto:calsify@ietf.org" target=3D"_blank">calsify@ietf.org</a><=
br>
<a href=3D"https://www.ietf.org/mailman/listinfo/calsify" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/mailman/listinfo/calsify</a><br>
</div></div></blockquote></div><br></div>

--089e0122f4ac8fb7f50535f3034a--


From nobody Fri Jun 24 06:13:15 2016
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From: Ken Murchison <murch@andrew.cmu.edu>
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Subject: [calsify] Review of draft-ietf-calext-extensions-03
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I'm starting to make the additions in the spec to libical and I noticed 
the following errors/omissions:

- Section 4: The CONFERENCE property should be listed in 'eventprop' and 
'todoprop' per Section 5.11.

- Section 5.8: "This property identified ..." -> "This property 
identifies ..."

- Section 5.8: Should 'sourceparam' specify that VALUE is required 
similar to what is done in 'refreshparam' and 'confparam'?


-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon Universit


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Subject: [calsify] Registration is open and hotel rooms can be booked for CalConnect XXXVII in Dresden, Germany, September 12-16 2016, hosted by dmfs (SmoothSync)
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This e-mail is going to more than one list, apologies if you receive it =
multiple times. =20


Registration is now open and hotel rooms may be booked for CalConnect =
XXXVII Dresden, September 12-16, 2016, hosted by dmfs (SmoothSync) =
<http://smoothsync.org/>. =20

The CalConnect XXXVII web page is located at =
https://www.calconnect.org/events/calconnect-xxxvii-september-12-16-2016 =
<https://www.calconnect.org/events/calconnect-xxxvii-september-12-16-2016>=
 and contains hotel information and booking, airport and transfer =
information, meeting venue, international travel information, etc. =20

The conference hotel and meeting venue is Schloss Eckberg =
<http://www.schloss-eckberg.de/en/>, Bautzner Stra=C3=9Fe 134, 01099 =
Dresden, Germany. The Schloss is on a hill next to the river Elbe, and =
is a short tram ride from the center of Dresden.=20

As noted under the Lodging section of the web page, you will have to =
book by e-mail or telephone call to get the special =E2=80=9CCalConnect=E2=
=80=9D rate. =20

The Interoperability Test Event and Developers Forum will take place on =
our usual schedule beginning Monday morning and going through Wednesday =
noon.  The Conference will begin Wednesday after lunch and run through =
Friday afternoon. =20

We will be posting schedules and agenda as soon as possible on the event =
web page, and expect that they may evolve over time.=20

On remote access:  We *may* be able to allow remote access for the Test =
Event via  Slack and etherpads.  We will not attempt to offer remote =
attendance at the conference. =20

This will be a unique event for us, not least because it=E2=80=99s in a =
castle (and you can even stay in the castle itself, although it costs =
more).  As always, contact me with any questions. =20

See you in Dresden!

Dave Thewlis


--
Dave Thewlis, Executive Director
CalConnect - The Calendaring and Scheduling Consortium
+1 707 840 9391 voice | +1 707 498 2238 mobile | +1 415 946 3454 fax
http://www.calconnect.org <http://www.calconnect.org/> | =
Dave.Thewlis@calconnect.org <mailto:Dave.Thewlis@calconnect.org>

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break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div class=3D""><span class=3D"">T<i =
class=3D"">his e-mail is going to more than one list, apologies if you =
receive it multiple times. &nbsp;</i></span></div><div class=3D""><span =
class=3D""><i class=3D""><br class=3D""></i></span></div><b =
class=3D""><div class=3D""><b class=3D""><br =
class=3D""></b></div>Registration is now open and hotel rooms may be =
booked for CalConnect XXXVII Dresden, September 12-16, 2016, hosted =
by&nbsp;<a href=3D"http://smoothsync.org/" class=3D"">dmfs =
(SmoothSync)</a>.&nbsp;</b>&nbsp;<div class=3D""><br class=3D""></div><div=
 class=3D"">The <i class=3D"">CalConnect XXXVII web page </i>is located =
at&nbsp;<a =
href=3D"https://www.calconnect.org/events/calconnect-xxxvii-september-12-1=
6-2016" =
class=3D"">https://www.calconnect.org/events/calconnect-xxxvii-september-1=
2-16-2016</a>&nbsp;and contains hotel information and booking, airport =
and transfer information, meeting&nbsp;venue, international travel =
information, etc. &nbsp;</div><div class=3D""><div class=3D""><div =
class=3D""><br class=3D""></div><div class=3D"">The <b =
class=3D"">conference hotel and meeting venue</b> is&nbsp;<a =
href=3D"http://www.schloss-eckberg.de/en/" class=3D"">Schloss =
Eckberg</a>, Bautzner Stra=C3=9Fe 134, 01099 Dresden, Germany. The =
Schloss is on a hill next to the river Elbe, and is a short tram ride =
from the center of Dresden.&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">As noted under the Lodging section of =
the web page, you will have to book by e-mail or telephone call to get =
the special =E2=80=9CCalConnect=E2=80=9D rate. &nbsp;</div><div =
class=3D""><br class=3D""></div><div class=3D"">The Interoperability =
Test Event and Developers Forum will take place on our usual schedule =
beginning Monday morning and going through Wednesday noon. &nbsp;The =
Conference will begin Wednesday after lunch and run through Friday =
afternoon. &nbsp;</div><div class=3D""><br class=3D""></div><div =
class=3D"">We will be posting schedules and agenda as soon as possible =
on the event web page, and expect that they may evolve over =
time.&nbsp;</div><div class=3D""><div class=3D""><br class=3D""></div><div=
 class=3D""><b class=3D"">On remote access:</b>&nbsp; We *may* be able =
to allow remote access for the Test Event via &nbsp;Slack and etherpads. =
&nbsp;We will not attempt to offer remote attendance at the conference. =
&nbsp;</div><div class=3D""><br class=3D""></div><div class=3D"">This =
will be a unique event for us, not least because it=E2=80=99s in a =
castle (and you can even stay in the castle itself, although it costs =
more). &nbsp;As always, contact me with any questions. &nbsp;</div><div =
class=3D""><br class=3D""></div><div class=3D"">See you in =
Dresden!</div><div class=3D""><br class=3D""></div><div class=3D"">Dave =
Thewlis</div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D"">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; " class=3D""><div =
class=3D"">--</div><div class=3D""><b class=3D"">Dave Thewlis, Executive =
Director</b></div><div class=3D""><b class=3D"">CalConnect - The =
Calendaring and Scheduling Consortium</b></div><div class=3D"">+1 707 =
840 9391 voice | +1 707 498 2238 mobile | +1 415 946 3454 fax</div><div =
class=3D""><a href=3D"http://www.calconnect.org" =
class=3D"">http://www.calconnect.org</a> | <a =
href=3D"mailto:Dave.Thewlis@calconnect.org" =
class=3D"">Dave.Thewlis@calconnect.org</a></div></div>
</div>
</div></div></div><br class=3D""></body></html>=

--Apple-Mail=_7D4C3436-C0E9-4210-B37B-D456AAAF284A--


From nobody Tue Jun 28 08:51:54 2016
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Cc: draft-ietf-calext-extensions@ietf.org, calext-chairs@ietf.org, mozilla@kewis.ch, calsify@ietf.org
Subject: [calsify] Benoit Claise's No Objection on draft-ietf-calext-extensions-03: (with COMMENT)
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Benoit Claise has entered the following ballot position for
draft-ietf-calext-extensions-03: No Objection

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The document, along with other ballot positions, can be found here:
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Dan Romacanu did the OPS DIR review. The RFC5706 does not apply.



From nobody Tue Jun 28 17:45:31 2016
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

This should be really easy to clear... 

Thank you for addressing the SecDir reviewers comments.  I'd like to see
the updated text added in the editor's version of the draft that
addresses the secdir review.  In particular, the email thread just says
that text was added to cover possible new threats and I'd like to see
that and the new privacy considerations section.
https://www.ietf.org/mail-archive/web/secdir/current/msg06636.html





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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

These should be easy to fix:

- This draft pretty clearly updates RFC 5545. But it isn't marked as
doing so.

- Sections 8.3 and 8.4 define new registries, but do not state a
registration policy. They refer to RFC 5545 section 8.2.6. That section
talks about registering new values, but does not appear to talk about new
registries. I think it's likely that the registration procedures from
5545 section 8.2.1 actually apply. If so, these sections should cite
that.


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

-5.11, description: There's citations for tel, http/https and data url
schemes. The "chat" scheme conspicuously lacks a citation. Since you use
xmpp in the example, maybe a citation to RFC 5122 (the xmpp: URI) would
be in order? Also, would it make sense to mention SIP URIs?

-6.1, description: Does ā€œ... MUST be used for the default behaviorā€ mean
something different than ā€œ... MUST be used.ā€?  (The "default" part seems
to weaken the MUST.

- 6.4: I'm surprised that this section has no mention of use of the
LANGUAGE parameter. I think maybe it should, at least in the example. Or
is this just one of those things an iCal person just knows because it
applies to any use of text value types?

-- In the description: "As a result, clients SHOULD expect to find this
      property parameter present on many different properties"

Why not MUST? Are there reasonable scenarios where a client might choose
not to expect that?



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----------------------------------------------------------------------
DISCUSS:
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- I think adding some privacy considerations to this would be good,
either as new text or via references.  Did the WG consider privacy
issues? Some that occur to me are:

   - names, descriptions and identifiers here are all ones that
     might allow (re)identification in unexpected ways

   - the UID property in particular probably ought be random and
     probably ought not be re-used for anything else, some RFC2119
     SHOULD statements about that would seem like they'd be good.

   - doing a refresh against a calendar at the expected frequency
     could be a good way to re-identify someone - if I can read the
     expected frequency and some IP address connects (even all over
     TLS) at about that regularity then I can be reasonably sure
     that the client is someone subscribed to that address, and
     maybe use that to track a person's movement across various
     networks. (That's different from the text in section 7 which
     assumes that the URL is what's tracked, but the connection
     can be just as revealing, for some calendars.)

I'm not trying to insist all that analysis be documented in this
draft but I would hope that the WG have considered the issues and
how best to document those and have a plan to do that. (If I'm told
such a plan exists and what it is, I'll clear.)

This is related to, but a little different from, Kathleen's discuss,
depending on the added privacy considerations text which I've not
managed to find in the secdir review thread.  But this should be as
easily cleared I'd guess.





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Hi Stephen,

On Wed, Jun 29, 2016, at 11:54 AM, Stephen Farrell wrote:

> - I think adding some privacy considerations to this would be good,
> either as new text or via references.  Did the WG consider privacy
> issues? Some that occur to me are:
> 
>    - names, descriptions and identifiers here are all ones that
>      might allow (re)identification in unexpected ways
> 
>    - the UID property in particular probably ought be random and
>      probably ought not be re-used for anything else, some RFC2119
>      SHOULD statements about that would seem like they'd be good.

Can you elaborate on what the concern is with UID, I don't understand?
(As far as I know, it is used for calendar resynchronization when the
same even can be change in different ways on 2 or more devices)


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Hiya,

On 29/06/16 12:13, Alexey Melnikov wrote:
> Hi Stephen,
>=20
> On Wed, Jun 29, 2016, at 11:54 AM, Stephen Farrell wrote:
>=20
>> - I think adding some privacy considerations to this would be good,
>> either as new text or via references.  Did the WG consider privacy
>> issues? Some that occur to me are:
>>
>>    - names, descriptions and identifiers here are all ones that
>>      might allow (re)identification in unexpected ways
>>
>>    - the UID property in particular probably ought be random and
>>      probably ought not be re-used for anything else, some RFC2119
>>      SHOULD statements about that would seem like they'd be good.
>=20
> Can you elaborate on what the concern is with UID, I don't understand?
> (As far as I know, it is used for calendar resynchronization when the
> same even can be change in different ways on 2 or more devices)
>=20

I'm not objecting at all to there being a UID for a calendar, just
saying that it probably ought not be re-used for anything else, e.g.
don't just re-use a UUID that happens to also correspond to the same
user for some other purpose for example. And saying to randomly
generate UIDs/UUIDs is probably also a good idea. It's possible that
that's already implicitly the case, but I didn't see it in this draft.

But the main point of the discuss though is not the set of things
that occurred to me after a quick read, but rather to ask if the WG
had thought about this stuff, and if so, what's the plan?

And another possible issue now occurs to me: I remember that one
social network had an issue where all the avatar image sizes were
nearly unique, so that even though those were all accessed over TLS,
one could identify users and their buddies by watching those be
downloaded. (That depended on how the social network in question
made avatar images available, which'll likely be different here.)
But there may be a reason to recommend normalising image sizes here
as well and to encourage only offering those over https and not
http.

I'm sure folks who know calendaring much better that I do would
likely come up with additional issues, and would certainly know
better which are real concerns, and which aren't.

Cheers,
S.






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Hi Ben,
Thank you for your review.

On Wed, Jun 29, 2016, at 02:29 AM, Ben Campbell wrote:

> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>=20
> These should be easy to fix:
>=20
> - This draft pretty clearly updates RFC 5545. But it isn't marked as
> doing so.

I agree with you. Cyrus?

> - Sections 8.3 and 8.4 define new registries, but do not state a
> registration policy. They refer to RFC 5545 section 8.2.6. That section
> talks about registering new values, but does not appear to talk about new
> registries. I think it's likely that the registration procedures from
> 5545 section 8.2.1 actually apply. If so, these sections should cite
> that.

Cyrus, I got confused by this as well, so getting a clarification on
what is intended here (or whether this is how iCalendar properties which
are enumerated values get registered) would be great.=20

> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>=20
> -5.11, description: There's citations for tel, http/https and data url
> schemes. The "chat" scheme conspicuously lacks a citation. Since you use
> xmpp in the example, maybe a citation to RFC 5122 (the xmpp: URI) would
> be in order? Also, would it make sense to mention SIP URIs?
>=20
> -6.1, description: Does =E2=80=9C... MUST be used for the default behavio=
r=E2=80=9D mean
> something different than =E2=80=9C... MUST be used.=E2=80=9D?  (The "defa=
ult" part seems
> to weaken the MUST.
>=20
> - 6.4: I'm surprised that this section has no mention of use of the
> LANGUAGE parameter. I think maybe it should, at least in the example. Or
> is this just one of those things an iCal person just knows because it
> applies to any use of text value types?
>=20
> -- In the description: "As a result, clients SHOULD expect to find this
>       property parameter present on many different properties"
>=20
> Why not MUST? Are there reasonable scenarios where a client might choose
> not to expect that?

All good comments.


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Date: Wed, 29 Jun 2016 09:49:59 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Kathleen Moriarty <Kathleen.Moriarty.ietf@gmail.com>, The IESG <iesg@ietf.org>
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Hi Kathleen,

--On June 28, 2016 at 5:45:25 PM -0700 Kathleen Moriarty 
<Kathleen.Moriarty.ietf@gmail.com> wrote:

> This should be really easy to clear...
>
> Thank you for addressing the SecDir reviewers comments.  I'd like to see
> the updated text added in the editor's version of the draft that
> addresses the secdir review.  In particular, the email thread just says
> that text was added to cover possible new threats and I'd like to see
> that and the new privacy considerations section.
> https://www.ietf.org/mail-archive/web/secdir/current/msg06636.html
>
>

I've attached a copy of the draft as it stands after the changes I have 
made. I was going to wait until after IESG review was done before 
publishing it, but I can just do it now if that would help.

-- 
Cyrus Daboo

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Network Working Group                                           C. Daboo
Internet-Draft                                                Apple Inc.
Updates: 5545 (if approved)                                June 28, 2016
Intended status: Standards Track
Expires: December 30, 2016


                      New Properties for iCalendar
                    draft-ietf-calext-extensions-04

Abstract

   This document defines a set of new properties for iCalendar data as
   well as extending the use of some existing properties to the entire
   iCalendar object.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 30, 2016.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.




Daboo                   Expires December 30, 2016               [Page 1]

Internet-Draft        iCalendar Property Extensions            June 2016


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Backwards Compatible Extension Properties . . . . . . . . . .   3
   4.  Modifications to Calendar Components  . . . . . . . . . . . .   3
   5.  Properties  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  NAME Property . . . . . . . . . . . . . . . . . . . . . .   5
     5.2.  DESCRIPTION Property  . . . . . . . . . . . . . . . . . .   6
     5.3.  UID Property  . . . . . . . . . . . . . . . . . . . . . .   6
     5.4.  LAST-MODIFIED Property  . . . . . . . . . . . . . . . . .   7
     5.5.  URL Property  . . . . . . . . . . . . . . . . . . . . . .   7
     5.6.  CATEGORIES Property . . . . . . . . . . . . . . . . . . .   7
     5.7.  REFRESH-INTERVAL Property . . . . . . . . . . . . . . . .   8
     5.8.  SOURCE Property . . . . . . . . . . . . . . . . . . . . .   9
     5.9.  COLOR Property  . . . . . . . . . . . . . . . . . . . . .   9
     5.10. IMAGE Property  . . . . . . . . . . . . . . . . . . . . .  10
     5.11. CONFERENCE Property . . . . . . . . . . . . . . . . . . .  12
   6.  Property Parameters . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  DISPLAY Property Parameter  . . . . . . . . . . . . . . .  13
     6.2.  EMAIL Property Parameter  . . . . . . . . . . . . . . . .  14
     6.3.  FEATURE Property Parameter  . . . . . . . . . . . . . . .  15
     6.4.  LABEL Property Parameter  . . . . . . . . . . . . . . . .  16
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  17
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
     9.1.  Property Registrations  . . . . . . . . . . . . . . . . .  17
     9.2.  Parameter Registrations . . . . . . . . . . . . . . . . .  18
     9.3.  Display Types Registry  . . . . . . . . . . . . . . . . .  18
     9.4.  Feature Types Registry  . . . . . . . . . . . . . . . . .  19
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  19
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  19
     11.2.  Informative References . . . . . . . . . . . . . . . . .  20
   Appendix A.  Change History (To be removed by RFC Editor before
                publication) . . . . . . . . . . . . . . . . . . . .  20
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  23

1.  Introduction

   The iCalendar [RFC5545] data format is used to represent calendar
   data and is used with iTIP [RFC5546] to handle scheduling operations
   between calendar users. iCalendar is in widespread use, and in
   accordance with provisions in that specification, extension elements
   have been added by various vendors to the data format in order to
   support and enhance capabilities.  This specification collects a
   number of these ad-hoc extensions and uses the new IANA registry
   capability defined in [RFC5545] to register standard variants with



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   clearly defined definitions and semantics.  In addition, some new
   elements are introduced for features that vendors have recently been
   requesting.

2.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

   The notation used in this memo is the ABNF notation of [RFC5234] as
   used by iCalendar [RFC5545].  Any syntax elements shown below that
   are not explicitly defined in this specification come from iCalendar
   [RFC5545].

3.  Backwards Compatible Extension Properties

   iCalendar defines properties which can have different value types
   indicated by a "VALUE" parameter.  The definition of a property
   specifies a "default" value type that is assumed to be used when no
   "VALUE" parameter is present.  However, this poses a problem to
   iCalendar parser/generator software that does not know about the
   default values for new properties.  For example, if a new property
   "FOO" were defined with a default value type of URI, and a URI value
   with a comma was used, an iCalendar generator not aware of this fact
   would likely treat the property value as "TEXT" and apply backslash
   escaping to the comma in the value, effectively making it an invalid
   URI value.

   To avoid this problem, this specification recommends that all
   properties not defined in [RFC5545], always include a "VALUE"
   parameter, if the type is other than "TEXT". i.e., in the example
   above, the "FOO" property would have a "VALUE=URI" parameter.  This
   allows iCalendar parser/generator software to track the correct types
   of unknown properties.

   New properties defined in this specification use the term "no
   default" in the "Value Type" definition to indicate that the "VALUE"
   parameter has to be included.

4.  Modifications to Calendar Components

   The following changes to the syntax defined in iCalendar [RFC5545]
   are made here.  New elements are defined in subsequent sections.


   calprops =/ *(



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                ;
                ; The following are OPTIONAL,
                ; but MUST NOT occur more than once.
                ;
                uid / last-mod / url /
                refresh / source / color
                ;
                ; The following are OPTIONAL,
                ; and MAY occur more than once.
                ;
                name / description / categories /
                image
                ;
                )

   eventprop =/ *(
                 ;
                 ; The following are OPTIONAL,
                 ; but MUST NOT occur more than once.
                 ;
                 color /
                 ;
                 ; The following are OPTIONAL,
                 ; and MAY occur more than once.
                 ;
                 conference / image
                 ;
                 )

   todoprop =/ *(
                ;
                ; The following are OPTIONAL,
                ; but MUST NOT occur more than once.
                ;
                color /
                ;
                ; The following are OPTIONAL,
                ; and MAY occur more than once.
                ;
                conference / image
                ;
                )

   jourprop =/ *(
                ;
                ; The following are OPTIONAL,
                ; but MUST NOT occur more than once.
                ;



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                color /
                ;
                ; The following are OPTIONAL,
                ; and MAY occur more than once.
                ;
                conference / image
                ;
                )

5.  Properties

5.1.  NAME Property

   Property Name:  NAME

   Purpose:  This property specifies the name of the calendar.

   Value Type:  TEXT

   Property Parameters:  IANA, non-standard, alternate text
      representation, and language property parameters can be specified
      on this property.

   Conformance:  This property can be specified multiple times in an
      iCalendar object.  However, each property MUST represent the name
      of the calendar in a different language.

   Description:  This property is used to specify a name of the
      iCalendar object that can be used by calendar user agents when
      presenting the calendar data to a user.  Whilst a calendar only
      has a single name, multiple language variants can be specified by
      including this property multiple times with different "LANGUAGE"
      parameter values on each.

   Format Definition:  This property is defined by the following
      notation:















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   name       = "NAME" nameparam ":" text CRLF

   nameparam  = *(
                 ;
                 ; The following are OPTIONAL,
                 ; but MUST NOT occur more than once.
                 ;
                 (";" altrepparam) / (";" languageparam) /
                 ;
                 ; The following is OPTIONAL,
                 ; and MAY occur more than once.
                 ;
                 (";" other-param)
                 ;
                 )

   Example:  The following is an example of this property:

   NAME:Company Vacation Days

5.2.  DESCRIPTION Property

   This specification modifies the definition of the "DESCRIPTION"
   property to allow it to be defined on an iCalendar object.  The
   following additions are made to the definition of this property,
   originally specified in Section 3.8.1.5 of [RFC5545].

   Purpose:  This property specifies the description of the calendar.

   Conformance:  This property can be specified multiple times in an
      iCalendar object.  However, each property MUST represent the
      description of the calendar in a different language.

   Description:  This property is used to specify a lengthy textual
      description of the iCalendar object that can be used by calendar
      user agents when describing the nature of the calendar data to a
      user.  Whilst a calendar only has a single description, multiple
      language variants can be specified by including this property
      multiple times with different "LANGUAGE" parameter values on each.

5.3.  UID Property

   This specification modifies the definition of the "UID" property to
   allow it to be defined on an iCalendar object.  The following
   additions are made to the definition of this property, originally
   specified in Section 3.8.4.7 of [RFC5545].





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   Purpose:  This property specifies the persistent, globally unique
      identifier for the iCalendar object.  This can be used, for
      example, to identify duplicate calendar streams that a client may
      have been given access to.  It can be used in conjunction with the
      "LAST-MODIFIED" property also specified on the "VCALENDAR" object,
      to identify the most recent version of a calendar.

   Conformance:  This property can be specified once in an iCalendar
      object.

5.4.  LAST-MODIFIED Property

   This specification modifies the definition of the "LAST-MODIFIED"
   property to allow it to be defined on an iCalendar object.  The
   following additions are made to the definition of this property,
   originally specified in Section 3.8.7.3 of [RFC5545].

   Purpose:  This property specifies the date and time that the
      information associated with the calendar was last revised.

   Conformance:  This property can be specified once in an iCalendar
      object.

5.5.  URL Property

   This specification modifies the definition of the "URL" property to
   allow it to be defined on an iCalendar object.  The following
   additions are made to the definition of this property, originally
   specified in Section 3.8.4.6 of [RFC5545].

   Purpose:  This property may be used to convey a location where a more
      dynamic rendition of the calendar information can be found.

   Conformance:  This property can be specified once in an iCalendar
      object.

5.6.  CATEGORIES Property

   This specification modifies the definition of the "CATEGORIES"
   property to allow it to be defined on an iCalendar object.  The
   following additions are made to the definition of this property,
   originally specified in Section 3.8.1.2 of [RFC5545].

   Purpose:  This property defines the categories for an entire
      calendar.

   Conformance:  This property can be specified multiple times in an
      iCalendar object.



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   Description:  When multiple properties are present, the set of
      categories that apply to the iCalendar object are the union of all
      the categories listed in each property value.

5.7.  REFRESH-INTERVAL Property

   Property Name:  REFRESH-INTERVAL

   Purpose:  This property specifies a suggested minimum interval for
      polling for changes of the calendar data from the original source
      of that data.

   Value Type:  DURATION - no default

   Property Parameters:  IANA and non-standard property parameters can
      be specified on this property.

   Conformance:  This property can be specified once in an iCalendar
      object.

   Description:  This property specifies a positive duration that gives
      a suggested minimum polling interval for checking for updates to
      the calendar data.  The value of this property SHOULD be used by
      calendar user agents to limit the polling interval for calendar
      data updates to the minimum interval specified.

   Format Definition:  This property is defined by the following
      notation:

   refresh      = "REFRESH-INTERVAL" refreshparam
                    ":" dur-value CRLF
                    ;consisting of a positive duration of time.

   refreshparam = *(
                   ;
                   ; The following is REQUIRED,
                   ; but MUST NOT occur more than once.
                   ;
                   (";" "VALUE" "=" "DURATION") /
                   ;
                   ; The following is OPTIONAL,
                   ; and MAY occur more than once.
                   ;
                   (";" other-param)
                   ;
                   )

   Example:  The following is an example of this property:



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   REFRESH-INTERVAL;VALUE=DURATION:P1W

5.8.  SOURCE Property

   Property Name:  SOURCE

   Purpose:  This property identified a URI where calendar data can be
      refreshed from.

   Value Type:  URI - no default

   Property Parameters:  IANA and non-standard property parameters can
      be specified on this property.

   Conformance:  This property can be specified once in an iCalendar
      object.

   Description:  This property identifies a location where a client can
      retrieve updated data for the calendar.  Clients SHOULD honor any
      specified "REFRESH-INTERVAL" value when periodically retrieving
      data.  Note that this property differs from the "URL" property in
      that "URL" is meant to provide an alternative representation of
      the calendar data, rather than the original location of the data.

   Format Definition:  This property is defined by the following
      notation:

   source       = "SOURCE" sourceparam ":" uri CRLF

   sourceparam = *(";" other-param)

   Example:  The following is an example of this property:

   SOURCE;VALUE=URI:https://example.com/holidays.ics

5.9.  COLOR Property

   Property Name:  COLOR

   Purpose:  This property specifies a color used for displaying the
      calendar, event, todo, or journal data.

   Value Type:  TEXT

   Property Parameters:  IANA and non-standard property parameters can
      be specified on this property.





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   Conformance:  This property can be specified once in an iCalendar
      object, or "VEVENT", "VTODO", or "VJOURNAL" calendar components.

   Description:  This property specifies a color that clients MAY use
      when presenting the relevant data to a user.  Typically this would
      appear as the "background" color of events or tasks.  The value is
      a case-insensitive color name taken from the CSS3 set of names,
      defined in Section 4.3 of [W3C.REC-css3-color-20110607].

   Format Definition:  This property is defined by the following
      notation:

   color          = "COLOR" colorparam ":" text CRLF
                     ; Value is CSS3 color name

   colorparam     = *(";" other-param)

   Example:  The following is an example of this property:

   COLOR:turquoise

5.10.  IMAGE Property

   Property Name:  IMAGE

   Purpose:  This property specifies an image associated with the
      calendar or a calendar component.

   Value Type:  URI or BINARY - no default.  The value MUST refer to or
      be data with a media type of "image".

   Property Parameters:  IANA, non-standard, display, inline encoding,
      and value data type property parameters can be specified on this
      property.  The format type parameter can be specified on this
      property and is RECOMMENDED for inline binary encoded content
      information.

   Conformance:  This property can be specified multiple times in an
      iCalendar object, or "VEVENT", "VTODO", or "VJOURNAL" calendar
      components.

   Description:  This property specifies an image for an iCalendar
      object or a calendar component via a uri or directly with inline
      data that can be used by calendar user agents when presenting the
      calendar data to a user.  Multiple properties MAY be used to
      specify alternative sets of images with, for example, varying
      media subtypes, resolutions or sizes.  When multiple properties
      are present, calendar user agents SHOULD display only one of them,



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      picking one that provides the most appropriate image quality, or
      display none.  The "DISPLAY" parameter is used to indicate the
      intended display mode for the image.  The "ALTREP" parameter,
      defined in [RFC5545], can be used to provide a "clickable" image
      where the URI in the parameter value can be "launched" by a click
      on the image in the calendar user agent.

   Format Definition:  This property is defined by the following
      notation:

   image      = "IMAGE" imageparam
                (
                  (
                    ";" "VALUE" "=" "URI"
                    ":" uri
                  ) /
                  (
                    ";" "ENCODING" "=" "BASE64"
                    ";" "VALUE" "=" "BINARY"
                    ":" binary
                  )
                )
                CRLF

   imageparam = *(
                 ;
                 ; The following is OPTIONAL for a URI value,
                 ; RECOMMENDED for a BINARY value,
                 ; and MUST NOT occur more than once.
                 ;
                 (";" fmttypeparam) /
                 ;
                 ; The following are OPTIONAL,
                 ; and MUST NOT occur more than once.
                 ;
                 (";" altrepparam) / (";" displayparam) /
                 ;
                 ; The following is OPTIONAL,
                 ; and MAY occur more than once.
                 ;
                 (";" other-param)
                 ;
                 )

   Example:  The following is an example of this property:

   IMAGE;VALUE=URI;DISPLAY=BADGE;FMTTYPE=image/png:h
    ttp://example.com/images/party.png



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5.11.  CONFERENCE Property

   Property Name:  CONFERENCE

   Purpose:  This property specifies information for accessing a
      conferencing system.

   Value Type:  URI - no default.

   Property Parameters:  IANA, non-standard, feature, and label property
      parameters can be specified on this property.

   Conformance:  This property can be specified multiple times in a
      "VEVENT" or "VTODO" calendar component.

   Description:  This property specifies information for accessing a
      conferencing system for attendees of a meeting or task.  This
      might be a tel: URI [RFC3966] for a telephone-based conference
      number dial-in (with access codes included), or it might be an
      http: or https: URI [RFC7230] for a web-based video chat, or a URI
      for an instant messaging group chat room.  If a specific URI for a
      conferencing system is not available, a data: URI [RFC2397]
      containing a text description can be used.

      A conference system can be a bi-directional communication channel,
      or a uni-directional "broadcast feed".

      The "FEATURE" property parameter is used to describe the key
      capabilities of the conference system to allow a client to choose
      the ones that give the required level of interaction from a set of
      multiple properties.

      The "LABEL" property paramater is used to convey additional
      details on the use of the URI.  For example, the URIs or access
      codes for the moderator and attendee of a teleconference system
      could be different, and the "LABEL" property parameter could be
      used to "tag" each "CONFERENCE" property to indicate which is
      which.

   Format Definition:  This property is defined by the following
      notation:










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   conference = "CONFERENCE" confparam  ":" uri CRLF

   confparam  = *(
                 ;
                 ; The following is REQUIRED,
                 ; but MUST NOT occur more than once.
                 ;
                 (";" "VALUE" "=" "URI") /
                 ;
                 ; The following are OPTIONAL,
                 ; and MUST NOT occur more than once.
                 ;
                 (";" featureparam) / (";" labelparam) /
                 ;
                 ; The following is OPTIONAL,
                 ; and MAY occur more than once.
                 ;
                 (";" other-param)
                 ;
                 )

   Example:  The following are examples of this property:

   CONFERENCE;VALUE=URI;FEATURE=PHONE,MODERATOR;
    LABEL=Moderator dial-in:tel:+1-412-555-0123,,,654321
   CONFERENCE;VALUE=URI;FEATURE=PHONE;
    LABEL=Attendee dial-in:tel:+1-412-555-0123,,,555123
   CONFERENCE;VALUE=URI;FEATURE=PHONE;
    LABEL=Attendee dial-in:tel:+1-888-555-0456,,,555123
   CONFERENCE;VALUE=URI;FEATURE=CHAT;
    LABEL=Chat room:xmpp:chat-123@conference.example.com
   CONFERENCE;VALUE=URI;FEATURE=AUDIO,VIDEO;
    LABEL=Attendee dial-in:https://chat.example.com/audio?id=123456

6.  Property Parameters

6.1.  DISPLAY Property Parameter

   Parameter Name:  DISPLAY

   Purpose:  To specify different ways in which an image for a calendar
      or component can be displayed.

   Format Definition:  This property parameter is defined by the
      following notation:






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   displayparam = "DISPLAY" "=" displayval *("," displayval)

   displayval =  ("BADGE" /     ; image inline with the title of the
                                ; event
                  "GRAPHIC" /   ; a full image replacement for the event
                                ; itself
                  "FULLSIZE" /  ; an image that is used to enhance the
                                ; event
                  "THUMBNAIL" / ; a smaller variant of "FULLSIZE" to be
                                ; used when space for the image is
                                ; constrained
                  x-name /      ; Experimental type
                  iana-token)   ; Other IANA registered type
                                ;
                                ; Default is BADGE

   Description:  This property parameter MAY be specified on "IMAGE"
      properties.  In the absence of this parameter, the value "BADGE"
      MUST be used for the default behavior.  The value determines how a
      client ought to present an image supplied in iCalendar data to the
      user.

      Values for this parameter are registered with IANA as per
      Section 9.3.  New values can be added to this registry following
      the procedure outlined in Section 8.2.1 of [RFC5545].

      Servers and clients MUST handle x-name and iana-token values they
      don't recognize by not displaying any image at all.

   Example:

   IMAGE;VALUE=URI;DISPLAY=BADGE,THUMBNAIL;FMTTYPE=image/png:https://exa
    mple.com/images/weather-cloudy.png

6.2.  EMAIL Property Parameter

   Parameter Name:  EMAIL

   Purpose:  To specify an email address that is used to identify or
      contact an organizer or attendee.

   Format Definition:  This property parameter is defined by the
      following notation:

   emailparam = "EMAIL" "=" param-value

   Description:  This property parameter MAY be specified on "ORGANIZER"
      or "ATTENDEE" properties.  This property can be used in situations



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      where the calendar user address value of "ORGANIZER" and
      "ATTENDEE" properties is not likely to be an identifier that
      recipients of scheduling messages could use to match the calendar
      user with, for example, an address book entry.  The value of this
      property is an email address that can easily be matched by
      recipients.  Recipients can also use this value as an alternative
      means of contacting the calendar user via email.  If a recipient's
      calendar user agent allows the recipient to save contact
      information based on the "ORGANIZER" or "ATTENDEE" properties,
      those calendar user agents SHOULD use any "EMAIL" property
      parameter value for the email address of the contact over any
      mailto: calendar user address specified as the value of the
      property.  Calendar user agents SHOULD NOT include an "EMAIL"
      property parameter when its value matches the calendar user
      address specified as the value of the property.

   Example:

   ATTENDEE;CN=Cyrus Daboo;EMAIL=cyrus@example.com:mailto:opaque-toke
    n-1234@example.com

6.3.  FEATURE Property Parameter

   Parameter Name:  FEATURE

   Purpose:  To specify a feature or features of a conference or
      broadcast system.

   Format Definition:  This property parameter is defined by the
      following notation:

   featureparam = "FEATURE" "=" featuretext *("," featuretext)
   featuretext  =  ("AUDIO" /     ; Audio capability
                    "CHAT" /      ; Chat or instant messaging
                    "FEED" /      ; Blog or Atom feed
                    "MODERATOR" / ; Moderator dial-in code
                    "PHONE" /     ; Phone conference
                    "SCREEN" /    ; Screen sharing
                    "VIDEO" /     ; Video capability
                    x-name /      ; Experimental type
                    iana-token)   ; Other IANA registered type

   Description:  This property parameter MAY be specified on the
      "CONFERENCE" property.  Multiple values can be specified.  The
      "MODERATOR" value is used to indicate that the property value is
      specific to the owner/initiator of the conference and contains a
      URI that "activates" the system (e.g., a "moderator" access code




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      for a phone conference system that is different from the "regular"
      access code).

   Example:

   CONFERENCE;VALUE=URI;FEATURE=AUDIO:rtsp://audio.example.com/
    event
   CONFERENCE;VALUE=URI;FEATURE=AUDIO,VIDEO:https://video-chat.exam
    ple.com/;group-id=1234

6.4.  LABEL Property Parameter

   Parameter Name:  LABEL

   Purpose:  To provide a human readable label.

   Format Definition:  This property parameter is defined by the
      following notation:

   labelparam = "LABEL" "=" param-value

   Description:  This property parameter MAY be specified on the
      "CONFERENCE" property.  It is anticipated that other extensions to
      iCalendar will re-use this property parameter on new properties
      that they define.  As a result, clients SHOULD expect to find this
      property parameter present on many different properties.  It
      provides a human readable label that can be presented to calendar
      users to allow them to discriminate between properties which might
      be similar, or provide additional information for properties that
      are not self-describing.

   Example:

   CONFERENCE;VALUE=URI;FEATURE=VIDEO;
    LABEL="Web video chat, access code=76543";
    :https://video-chat.example.com/;group-id=1234

7.  Security Considerations

   Several of the new properties or parameters defined by this
   specification allow reference to "external" URIs.  Care MUST be taken
   when accessing data at external URIs as malicious content could be
   present.  Clients SHOULD ensure that suitable permission is granted
   by calendar users before such URIs are dereferenced.

   The "REFRESH-INTERVAL" property could be used by an attacker to make
   a client carry out rapid requests to the server hosting the calendar,
   by specifying a very short duration (e.g., one second).  This could



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   lead to resource consumption on the client or server, and denial-of-
   service attacks against the server.  Clients MUST ensure that they
   throttle requests to the server to a reasonable rate.  In most cases,
   updating a public calendar once per day would suffice.  If the
   "REFRESH-INTERVAL" is any less than that, clients SHOULD warn the
   calendar user and allow them to override it with a longer value.

   The "CONFERENCE" property can include a "FEATURE" property parameter
   with a "MODERATOR" value.  In some cases the access code used by the
   owner/initiator of a conference might be private to an individual and
   clients and servers MUST ensure that such properties are not sent to
   attendees of a scheduled component, or sharees of a shared component.

   Both the "COLOR" and "IMAGE" properties are likely to be used by
   calendar users to express their own personal view of the calendar
   data.  In addition, these properties could be used by attackers to
   produce a confusing display in a calendar user agent.  When such
   properties are encountered in calendar data that has come from other
   calendar users (e.g., via a scheduling message, "public" calendar
   subscription, shared calendar etc), it is advisable for the client to
   give the receiving calendar user the option to remove (or adjust)
   these properties as the data is imported into their calendar system.

   Security considerations in [RFC5545], and [RFC5546] MUST also be
   adhered to.

8.  Privacy Considerations

   Several of the new properties or parameters defined by this
   specification allow reference to "external" URIs.  Access to those
   URIs could be tracked, leading to loss of privacy.  Clients SHOULD
   ensure that suitable permission is granted by calendar users before
   such URIs are dereferenced.

   Privacy considerations in [RFC5545], and [RFC5546] MUST also be
   adhered to.

9.  IANA Considerations

9.1.  Property Registrations

   This document defines the following new iCalendar properties to be
   added to the registry defined in Section 8.3.2 of [RFC5545]:








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   +------------------+---------+--------------------------------------+
   | Property         | Status  | Reference                            |
   +------------------+---------+--------------------------------------+
   | NAME             | Current | RFCXXXX, Section 5.1                 |
   | DESCRIPTION      | Current | RFC5545 Section 3.8.1.5, RFCXXXX,    |
   |                  |         | Section 5.2                          |
   | UID              | Current | RFC5545 Section 3.8.4.7, RFCXXXX,    |
   |                  |         | Section 5.3                          |
   | LAST-MODIFIED    | Current | RFC5545 Section 3.8.7.3, RFCXXXX,    |
   |                  |         | Section 5.4                          |
   | URL              | Current | RFC5545 Section 3.8.4.6, RFCXXXX,    |
   |                  |         | Section 5.5                          |
   | CATEGORIES       | Current | RFC5545 Section 3.8.1.2, RFCXXXX,    |
   |                  |         | Section 5.6                          |
   | REFRESH-INTERVAL | Current | RFCXXXX, Section 5.7                 |
   | SOURCE           | Current | RFCXXXX, Section 5.8                 |
   | COLOR            | Current | RFCXXXX, Section 5.9                 |
   | IMAGE            | Current | RFCXXXX, Section 5.10                |
   | CONFERENCE       | Current | RFCXXXX, Section 5.11                |
   +------------------+---------+--------------------------------------+

9.2.  Parameter Registrations

   This document defines the following new iCalendar property parameters
   to be added to the registry defined in Section 8.3.3 of [RFC5545]:

          +--------------------+---------+----------------------+
          | Property Parameter | Status  | Reference            |
          +--------------------+---------+----------------------+
          | DISPLAY            | Current | RFCXXXX, Section 6.1 |
          | EMAIL              | Current | RFCXXXX, Section 6.2 |
          | FEATURE            | Current | RFCXXXX, Section 6.3 |
          | LABEL              | Current | RFCXXXX, Section 6.4 |
          +--------------------+---------+----------------------+

9.3.  Display Types Registry

   This document defines the following new iCalendar value registry as
   per Section 8.2.6 of [RFC5545]:

             +--------------+---------+----------------------+
             | Display Type | Status  | Reference            |
             +--------------+---------+----------------------+
             | BADGE        | Current | RFCXXXX, Section 6.1 |
             | GRAPHIC      | Current | RFCXXXX, Section 6.1 |
             | FULLSIZE     | Current | RFCXXXX, Section 6.1 |
             | THUMBNAIL    | Current | RFCXXXX, Section 6.1 |
             +--------------+---------+----------------------+



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9.4.  Feature Types Registry

   This document defines the following new iCalendar value registry as
   per Section 8.2.6 of [RFC5545]:

             +--------------+---------+----------------------+
             | Feature Type | Status  | Reference            |
             +--------------+---------+----------------------+
             | AUDIO        | Current | RFCXXXX, Section 6.3 |
             | CHAT         | Current | RFCXXXX, Section 6.3 |
             | FEED         | Current | RFCXXXX, Section 6.3 |
             | MODERATOR    | Current | RFCXXXX, Section 6.3 |
             | PHONE        | Current | RFCXXXX, Section 6.3 |
             | SCREEN       | Current | RFCXXXX, Section 6.3 |
             | VIDEO        | Current | RFCXXXX, Section 6.3 |
             +--------------+---------+----------------------+

10.  Acknowledgments

   Thanks to the following for feedback: Bernard Desruisseaux, Mike
   Douglass, Lucia Fedorova, Ken Murchison, Arnaud Quillaud, and Dave
   Thewlis.

   This specification came about via discussions at the Calendaring and
   Scheduling Consortium.

11.  References

11.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234,
              DOI 10.17487/RFC5234, January 2008,
              <http://www.rfc-editor.org/info/rfc5234>.

   [RFC5545]  Desruisseaux, B., Ed., "Internet Calendaring and
              Scheduling Core Object Specification (iCalendar)",
              RFC 5545, DOI 10.17487/RFC5545, September 2009,
              <http://www.rfc-editor.org/info/rfc5545>.







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   [RFC5546]  Daboo, C., Ed., "iCalendar Transport-Independent
              Interoperability Protocol (iTIP)", RFC 5546,
              DOI 10.17487/RFC5546, December 2009,
              <http://www.rfc-editor.org/info/rfc5546>.

   [W3C.REC-css3-color-20110607]
              A&#135;elik, T., Lilley, C., and D. Baron, "CSS Color
              Module Level 3", World Wide Web Consortium Recommendation
              REC-css3-color-20110607, June 2011,
              <http://www.w3.org/TR/2011/REC-css3-color-20110607>.

11.2.  Informative References

   [RFC2397]  Masinter, L., "The "data" URL scheme", RFC 2397,
              DOI 10.17487/RFC2397, August 1998,
              <http://www.rfc-editor.org/info/rfc2397>.

   [RFC3966]  Schulzrinne, H., "The tel URI for Telephone Numbers",
              RFC 3966, DOI 10.17487/RFC3966, December 2004,
              <http://www.rfc-editor.org/info/rfc3966>.

   [RFC7230]  Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
              Protocol (HTTP/1.1): Message Syntax and Routing",
              RFC 7230, DOI 10.17487/RFC7230, June 2014,
              <http://www.rfc-editor.org/info/rfc7230>.

Appendix A.  Change History (To be removed by RFC Editor before
             publication)

   Changes in draft-ietf-calext-extensions-04:

   1.  SECDIR: Added new items to Security Considerations and added
       Privacy Considerations.

   2.  SECDIR: fixed missing conference item in component ABNF
       definitions.

   3.  SECDIR: editorial fixes.

   Changes in draft-ietf-calext-extensions-03:

   1.  AD: fixed =/ ABNF syntax.

   2.  AD: added description for CATEGORIES.

   3.  AD: Removed extra / in image ABNF.

   4.  AD: Fixed VALUE=URI in image ABNF.



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   5.  AD: Mention https in addition to http.  Changed all examples to
       use https:

   6.  AD: fixed DISPLAY ABNF syntax.

   Changes in draft-ietf-calext-extensions-02:

   1.  Refresh expired draft - no changes.

   Changes in draft-ietf-calext-extensions-01:

   1.  Clarified difference between SOURCE and URL properties.

   2.  Use labelparam not infoparam.

   Changes in draft-ietf-calext-extensions-00:

   1.  Document renamed after WG adoption.

   2.  Fixed tel: URI reference.

   Changes in draft-daboo-icalendar-extensions-09:

   1.  Re-instated a trimmed down version of the CONFERENCE property
       after serious interest expressed by implementors.

   2.  LABEL property used instead of INFO - appropriated from another
       iCalendar draft.

   Changes in draft-daboo-icalendar-extensions-08:

   1.  Trimmed down the display values to a minimal set.

   Changes in draft-daboo-icalendar-extensions-07:

   1.   Removed ALTURI parameter - now use ALTREP.

   2.   Removed VALID property.

   3.   Removed TIMEZONE-ID property.

   4.   Added FULLSIZE and THUMBNAIL display values.

   5.   Added EMAIL property parameter.

   6.   Added LAST-MODIFIED property for use with VCALENDAR.

   7.   Added CATEGORIES property for use with VCALENDAR.



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   8.   URL use now aligned with 5545.

   9.   Added SOURCE property.

   10.  COLOR now uses CSS3 values.

   Changes in draft-daboo-icalendar-extensions-06:

   1.  Removed BROADCAST/CONFERENCE properties and related parameters.

   Changes in draft-daboo-icalendar-extensions-05:

   1.  Added section with recommendation on handling extension
       properties.

   2.  Added VALID property.

   Changes in draft-daboo-icalendar-extensions-04:

   1.  TZID changed to new property TIMEZONE-ID.

   2.  Minor formal syntax changes.

   Changes in draft-daboo-icalendar-extensions-03:

   1.  Dropped CALENDAR- prefix

   2.  DESCRIPTION, UID and TZID now based on existing RFC5545
       properties

   3.  COLOR now on both the calendar and component level

   4.  IMAGE now on both the calendar and component level

   5.  Added FEATURE and REGION parameters to CONFERENCE property

   6.  Added ALTURI parameter to IMAGE property

   7.  Added FEED value to FEATURE parameter

   8.  Added BROADCAST property and clarified that CONFERENCE is for bi-
       direction channels and BROADCAST is for uni-directional.

   Changes in draft-daboo-icalendar-extensions-02:

   1.  Minor wording changes.

   2.  Interval is now described as the "minimum interval".



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   3.  Added CONFERENCE property and INFO parameter.

   Changes in draft-daboo-icalendar-extensions-01:

   1.  Fixed DISPLAY parameter handling of x- and iana tokens to state
       that clients ignore the image if the token is not recognized.

   2.  Allow language variants for CALENDAR-NAME and CALENDAR-
       DESCRIPTION.

   3.  Added registry for DISPLAY values.

Author's Address

   Cyrus Daboo
   Apple Inc.
   1 Infinite Loop
   Cupertino, CA  95014
   USA

   Email: cyrus@daboo.name
   URI:   http://www.apple.com/





























Daboo                   Expires December 30, 2016              [Page 23]

--==========092632082C1B873F6048==========--




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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Wed, 29 Jun 2016 09:56:10 -0400
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Subject: Re: [calsify] Kathleen Moriarty's Discuss on draft-ietf-calext-extensions-03: (with DISCUSS)
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On Wed, Jun 29, 2016 at 9:49 AM, Cyrus Daboo <cyrus@daboo.name> wrote:
> Hi Kathleen,
>
> --On June 28, 2016 at 5:45:25 PM -0700 Kathleen Moriarty
> <Kathleen.Moriarty.ietf@gmail.com> wrote:
>
>> This should be really easy to clear...
>>
>> Thank you for addressing the SecDir reviewers comments.  I'd like to see
>> the updated text added in the editor's version of the draft that
>> addresses the secdir review.  In particular, the email thread just says
>> that text was added to cover possible new threats and I'd like to see
>> that and the new privacy considerations section.
>> https://www.ietf.org/mail-archive/web/secdir/current/msg06636.html
>>
>>
>
> I've attached a copy of the draft as it stands after the changes I have
> made. I was going to wait until after IESG review was done before publishing
> it, but I can just do it now if that would help.
>

I think it would help to update prior to Stephen's review and Alissa's
if they haven't read it already as they will also want to review the
updated text.

Thanks!
> --
> Cyrus Daboo



-- 

Best regards,
Kathleen


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Hi Cyrus,


On 29/06/2016 14:49, Cyrus Daboo wrote:
> Hi Kathleen,
>
> --On June 28, 2016 at 5:45:25 PM -0700 Kathleen Moriarty 
> <Kathleen.Moriarty.ietf@gmail.com> wrote:
>
>> This should be really easy to clear...
>>
>> Thank you for addressing the SecDir reviewers comments.  I'd like to see
>> the updated text added in the editor's version of the draft that
>> addresses the secdir review.  In particular, the email thread just says
>> that text was added to cover possible new threats and I'd like to see
>> that and the new privacy considerations section.
>> https://www.ietf.org/mail-archive/web/secdir/current/msg06636.html
>>
>
> I've attached a copy of the draft as it stands after the changes I 
> have made. I was going to wait until after IESG review was done before 
> publishing it, but I can just do it now if that would help.
Please post it now.


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Calendaring Extensions of the IETF.

        Title           : New Properties for iCalendar
        Author          : Cyrus Daboo
	Filename        : draft-ietf-calext-extensions-04.txt
	Pages           : 23
	Date            : 2016-06-29

Abstract:
   This document defines a set of new properties for iCalendar data as
   well as extending the use of some existing properties to the entire
   iCalendar object.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-calext-extensions-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-calext-extensions-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Date: Wed, 29 Jun 2016 10:02:52 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
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Hi Kathleen,

--On June 29, 2016 at 9:56:10 AM -0400 Kathleen Moriarty 
<kathleen.moriarty.ietf@gmail.com> wrote:

> I think it would help to update prior to Stephen's review and Alissa's
> if they haven't read it already as they will also want to review the
> updated text.

New -04 version of the draft has now been posted.

-- 
Cyrus Daboo


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On Wed, Jun 29, 2016 at 10:02 AM, Cyrus Daboo <cyrus@daboo.name> wrote:
> Hi Kathleen,
>
> --On June 29, 2016 at 9:56:10 AM -0400 Kathleen Moriarty
> <kathleen.moriarty.ietf@gmail.com> wrote:
>
>> I think it would help to update prior to Stephen's review and Alissa's
>> if they haven't read it already as they will also want to review the
>> updated text.
>
>
> New -04 version of the draft has now been posted.

Thank you!  I'll look at it in a little while.

>
> --
> Cyrus Daboo
>



-- 

Best regards,
Kathleen


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Date: Wed, 29 Jun 2016 11:46:04 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Ben Campbell <ben@nostrum.com>, The IESG <iesg@ietf.org>
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Hi Ben,

--On June 28, 2016 at 6:29:24 PM -0700 Ben Campbell <ben@nostrum.com> =
wrote:

> These should be easy to fix:
>
> - This draft pretty clearly updates RFC 5545. But it isn't marked as
> doing so.

I have already made that change in my working copy in response to earlier=20
reviews. I just sent a copy of my current draft in response to another IESG =

review comment.

> - Sections 8.3 and 8.4 define new registries, but do not state a
> registration policy. They refer to RFC 5545 section 8.2.6. That section
> talks about registering new values, but does not appear to talk about new
> registries. I think it's likely that the registration procedures from
> 5545 section 8.2.1 actually apply. If so, these sections should cite
> that.

Good point. I have now created a new Section 9.3 (was 8.3 in previous=20
draft) that has the previous 8.3 and 8.4 as sub-sections. Text within the=20
new 9.3 is:

9.3.  Property Parameter Value Registries

   Two new IANA registries for iCalendar elements have been added.
   Additional codes MAY be used, provided the process described in
   Section 8.2.1 of [RFC5545] is used to register them, using the
   template in Section 8.2.6 of [RFC5545].

> -5.11, description: There's citations for tel, http/https and data url
> schemes. The "chat" scheme conspicuously lacks a citation. Since you use
> xmpp in the example, maybe a citation to RFC 5122 (the xmpp: URI) would
> be in order? Also, would it make sense to mention SIP URIs?

I've added sip/sips and xmpp as examples. New text:

   Description:  This property specifies information for accessing a
      conferencing system for attendees of a meeting or task.  This
      might be for a telephone-based conference number dial-in with
      access codes included (such as a tel: URI [RFC3966] or a sip: or
      sips: URI [RFC3261]), or it might be for a web-based video chat
      (such as a http: or https: URI [RFC7230]), or a URI for an instant
      messaging group chat room (such as an xmpp: URI [RFC5122]).  If a
      specific URI for a conferencing system is not available, a data:
      URI [RFC2397] containing a text description can be used.

> -6.1, description: Does =E2=80=9C... MUST be used for the default =
behavior=E2=80=9D
> mean something different than =E2=80=9C... MUST be used.=E2=80=9D?  (The =
"default"
> part seems to weaken the MUST.

Changed to:

    In the absence of this parameter, the default value
      "BADGE" MUST be used.
>
> - 6.4: I'm surprised that this section has no mention of use of the
> LANGUAGE parameter. I think maybe it should, at least in the example. Or
> is this just one of those things an iCal person just knows because it
> applies to any use of text value types?

Appropriate language tagging in iCalendar is a tricky subject. There is no=20
single property that defines a default language for the text within an=20
iCalendar object, and there is reluctance to add the LANGUAGE parameter to=20
every property that has text values due to increase in the size of the data =

that would result. Now that I think about it, it would actually have made=20
sense for this specification to define DEFAULT-LANGUAGE as a top-level=20
property. Instead, I think we can try doing that in=20
<https://tools.ietf.org/html/draft-douglass-calendar-extension-06> which,=20
amongst other things, attempts to support multi-lingual iCalendar objects=20
(I've just chatted with the author of that draft and he is on board with=20
that too). I am hoping that draft will be adopted as follow on work by the=20
WG.

In the meantime I propose the following adjustments to this draft:

1) Add languageparam to the ABNF of the CONFERENCE property

2) Add new paragraph to the CONFERENCE property description:

      The "LANGUAGE" property parameter can be used to specify the
      language used for text values used with this property (as per
      Section 3.2.10 of [RFC5545].

3) The LABEL parameter description has the following sentence appended to=20
it:

    The "LANGUAGE" property parameter can be
      used to specify the language of the text in the parameter value
      (as per Section 3.2.10 of [RFC5545].

> -- In the description: "As a result, clients SHOULD expect to find this
>       property parameter present on many different properties"
>
> Why not MUST? Are there reasonable scenarios where a client might choose

I will change to MUST.

--=20
Cyrus Daboo


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Hi Stephen,
Please see the new -04 draft which has added a privacy section, and also 
has changes to the security section.

--On June 29, 2016 at 3:54:19 AM -0700 Stephen Farrell 
<stephen.farrell@cs.tcd.ie> wrote:

> - I think adding some privacy considerations to this would be good,
> either as new text or via references.  Did the WG consider privacy
> issues? Some that occur to me are:
>
>    - names, descriptions and identifiers here are all ones that
>      might allow (re)identification in unexpected ways

Privacy issues were not specifically considered by the WG (in fact the 
privacy section was only recently added). Please review the current privacy 
section in the -04 draft. In addition, I will add the following paragraph 
(and the one indicated later in this email):

   In general, users have to rely on the privacy policies of any
   conferencing system being accessed via the "CONFERENCE" property, for
   their own privacy protection.  It is entirely possible for such
   systems to uniquely identify and log the activity and participation
   (or not) of calendar users in the conference.  Calendar user agents
   SHOULD track which conferencing systems are used and warn users the
   first time a new one is about to be used.  This is particularly
   important if the client automatically "dials in" to the conference
   when the event start time occurs.


>    - the UID property in particular probably ought be random and
>      probably ought not be re-used for anything else, some RFC2119
>      SHOULD statements about that would seem like they'd be good.

The definition of "UID" comes from 5545, which already states:

    The "UID" itself MUST be a globally unique identifier.

However, 5545 then goes on to suggest "good" ways to create it which 
include use of domain and IP literals, which are clearly not appropriate 
any more. So, given this draft is updating 5545, do we want to correct that 
now by making a stronger statement that the UID value should be "opaque"? 
My implementations just generate UUIDs - perhaps that should be a new 
recommendation. If we want to do that, then I would add additional text in 
section 5.3 as well as the privacy section. But the question is whether it 
is appropriate for this draft to attempt such a fix - I think that is 
something the working group will need to comment on.

>    - doing a refresh against a calendar at the expected frequency
>      could be a good way to re-identify someone - if I can read the
>      expected frequency and some IP address connects (even all over
>      TLS) at about that regularity then I can be reasonably sure
>      that the client is someone subscribed to that address, and
>      maybe use that to track a person's movement across various
>      networks. (That's different from the text in section 7 which
>      assumes that the URL is what's tracked, but the connection
>      can be just as revealing, for some calendars.)

I propose adding the following to the privacy section:

   By giving different calendar users different values for the "REFRESH-
   INTERVAL" property, it is possible for a publisher of calendar data
   to uniquely identify each refresh from each calendar users' clients,
   and thereby track user activity and IP address over time.  To address
   this, clients SHOULD add or subtract some random amount of time from
   the published "REFRESH-INTERVAL" value when doing actual refreshes.



-- 
Cyrus Daboo


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To: "Cyrus Daboo" <cyrus@daboo.name>
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Subject: Re: [calsify] Ben Campbell's Discuss on draft-ietf-calext-extensions-03: (with DISCUSS and COMMENT)
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Hi Cyrus,

All of your responses work for me. I will clear the discuss, under the 
assumption that the proposed changes will make it into a submitted 
update.

Thanks!

Ben.

On 29 Jun 2016, at 10:46, Cyrus Daboo wrote:

> Hi Ben,
>
> --On June 28, 2016 at 6:29:24 PM -0700 Ben Campbell <ben@nostrum.com> 
> wrote:
>
>> These should be easy to fix:
>>
>> - This draft pretty clearly updates RFC 5545. But it isn't marked as
>> doing so.
>
> I have already made that change in my working copy in response to 
> earlier reviews. I just sent a copy of my current draft in response to 
> another IESG review comment.
>
>> - Sections 8.3 and 8.4 define new registries, but do not state a
>> registration policy. They refer to RFC 5545 section 8.2.6. That 
>> section
>> talks about registering new values, but does not appear to talk about 
>> new
>> registries. I think it's likely that the registration procedures from
>> 5545 section 8.2.1 actually apply. If so, these sections should cite
>> that.
>
> Good point. I have now created a new Section 9.3 (was 8.3 in previous 
> draft) that has the previous 8.3 and 8.4 as sub-sections. Text within 
> the new 9.3 is:
>
> 9.3.  Property Parameter Value Registries
>
>   Two new IANA registries for iCalendar elements have been added.
>   Additional codes MAY be used, provided the process described in
>   Section 8.2.1 of [RFC5545] is used to register them, using the
>   template in Section 8.2.6 of [RFC5545].
>
>> -5.11, description: There's citations for tel, http/https and data 
>> url
>> schemes. The "chat" scheme conspicuously lacks a citation. Since you 
>> use
>> xmpp in the example, maybe a citation to RFC 5122 (the xmpp: URI) 
>> would
>> be in order? Also, would it make sense to mention SIP URIs?
>
> I've added sip/sips and xmpp as examples. New text:
>
>   Description:  This property specifies information for accessing a
>      conferencing system for attendees of a meeting or task.  This
>      might be for a telephone-based conference number dial-in with
>      access codes included (such as a tel: URI [RFC3966] or a sip: or
>      sips: URI [RFC3261]), or it might be for a web-based video chat
>      (such as a http: or https: URI [RFC7230]), or a URI for an 
> instant
>      messaging group chat room (such as an xmpp: URI [RFC5122]).  If a
>      specific URI for a conferencing system is not available, a data:
>      URI [RFC2397] containing a text description can be used.
>
>> -6.1, description: Does ā€œ... MUST be used for the default 
>> behaviorā€
>> mean something different than ā€œ... MUST be used.ā€?  (The 
>> "default"
>> part seems to weaken the MUST.
>
> Changed to:
>
>    In the absence of this parameter, the default value
>      "BADGE" MUST be used.
>>
>> - 6.4: I'm surprised that this section has no mention of use of the
>> LANGUAGE parameter. I think maybe it should, at least in the example. 
>> Or
>> is this just one of those things an iCal person just knows because it
>> applies to any use of text value types?
>
> Appropriate language tagging in iCalendar is a tricky subject. There 
> is no single property that defines a default language for the text 
> within an iCalendar object, and there is reluctance to add the 
> LANGUAGE parameter to every property that has text values due to 
> increase in the size of the data that would result. Now that I think 
> about it, it would actually have made sense for this specification to 
> define DEFAULT-LANGUAGE as a top-level property. Instead, I think we 
> can try doing that in 
> <https://tools.ietf.org/html/draft-douglass-calendar-extension-06> 
> which, amongst other things, attempts to support multi-lingual 
> iCalendar objects (I've just chatted with the author of that draft and 
> he is on board with that too). I am hoping that draft will be adopted 
> as follow on work by the WG.
>
> In the meantime I propose the following adjustments to this draft:
>
> 1) Add languageparam to the ABNF of the CONFERENCE property
>
> 2) Add new paragraph to the CONFERENCE property description:
>
>      The "LANGUAGE" property parameter can be used to specify the
>      language used for text values used with this property (as per
>      Section 3.2.10 of [RFC5545].
>
> 3) The LABEL parameter description has the following sentence appended 
> to it:
>
>    The "LANGUAGE" property parameter can be
>      used to specify the language of the text in the parameter value
>      (as per Section 3.2.10 of [RFC5545].
>
>> -- In the description: "As a result, clients SHOULD expect to find 
>> this
>>       property parameter present on many different properties"
>>
>> Why not MUST? Are there reasonable scenarios where a client might 
>> choose
>
> I will change to MUST.
>
> -- 
> Cyrus Daboo


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Subject: [calsify] Ben Campbell's No Objection on draft-ietf-calext-extensions-04: (with COMMENT)
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Ben Campbell has entered the following ballot position for
draft-ietf-calext-extensions-04: No Objection

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Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
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The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

The author has addressed all my DISCUSS points and comments in email.
(Thanks!). I've cleared on the assumption the proposed text will make it
into a revision.



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Hiya,

On 29/06/16 17:20, Cyrus Daboo wrote:
> Hi Stephen,
> Please see the new -04 draft which has added a privacy section, and als=
o
> has changes to the security section.
>=20
> --On June 29, 2016 at 3:54:19 AM -0700 Stephen Farrell
> <stephen.farrell@cs.tcd.ie> wrote:
>=20
>> - I think adding some privacy considerations to this would be good,
>> either as new text or via references.  Did the WG consider privacy
>> issues? Some that occur to me are:
>>
>>    - names, descriptions and identifiers here are all ones that
>>      might allow (re)identification in unexpected ways
>=20
> Privacy issues were not specifically considered by the WG (in fact the
> privacy section was only recently added).=20

Ah ok. Is that something that needs further work, either here
or perhaps better as a separate document that considers privacy
issues with caldav? If so, do you think there might be folks
who'd be interested in doing that work?

I'm guessing that the answers might be "yes" and "umm, not
sure" in that order:-)

Anyway, I'll clear my discuss on this document and chat with
Alexey tomorrow on the call (or via email is fine too) about
the general issue and whether it's feasible to think about
some folks doing work on that.

> Please review the current
> privacy section in the -04 draft. In addition, I will add the following=

> paragraph (and the one indicated later in this email):
>=20
>   In general, users have to rely on the privacy policies of any
>   conferencing system being accessed via the "CONFERENCE" property, for=

>   their own privacy protection.  It is entirely possible for such
>   systems to uniquely identify and log the activity and participation
>   (or not) of calendar users in the conference.  Calendar user agents
>   SHOULD track which conferencing systems are used and warn users the
>   first time a new one is about to be used.  This is particularly
>   important if the client automatically "dials in" to the conference
>   when the event start time occurs.
>=20
>=20
>>    - the UID property in particular probably ought be random and
>>      probably ought not be re-used for anything else, some RFC2119
>>      SHOULD statements about that would seem like they'd be good.
>=20
> The definition of "UID" comes from 5545, which already states:
>=20
>    The "UID" itself MUST be a globally unique identifier.
>=20
> However, 5545 then goes on to suggest "good" ways to create it which
> include use of domain and IP literals, which are clearly not appropriat=
e
> any more. So, given this draft is updating 5545, do we want to correct
> that now by making a stronger statement that the UID value should be
> "opaque"? My implementations just generate UUIDs - perhaps that should
> be a new recommendation. If we want to do that, then I would add
> additional text in section 5.3 as well as the privacy section. But the
> question is whether it is appropriate for this draft to attempt such a
> fix - I think that is something the working group will need to comment =
on.
>=20
>>    - doing a refresh against a calendar at the expected frequency
>>      could be a good way to re-identify someone - if I can read the
>>      expected frequency and some IP address connects (even all over
>>      TLS) at about that regularity then I can be reasonably sure
>>      that the client is someone subscribed to that address, and
>>      maybe use that to track a person's movement across various
>>      networks. (That's different from the text in section 7 which
>>      assumes that the URL is what's tracked, but the connection
>>      can be just as revealing, for some calendars.)
>=20
> I propose adding the following to the privacy section:
>=20
>   By giving different calendar users different values for the "REFRESH-=

>   INTERVAL" property, it is possible for a publisher of calendar data
>   to uniquely identify each refresh from each calendar users' clients,
>   and thereby track user activity and IP address over time.  To address=

>   this, clients SHOULD add or subtract some random amount of time from
>   the published "REFRESH-INTERVAL" value when doing actual refreshes.
>=20

All of the above are good additions. (Did you see the additional
point I raised about image size normalisation in a mail with
Alexey? Including that too might be good.)

Cheers,
S.


>=20
>=20


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--------------ms050607030706020102000001--


From nobody Wed Jun 29 09:40:17 2016
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Subject: [calsify] Stephen Farrell's No Objection on draft-ietf-calext-extensions-04: (with COMMENT)
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Stephen Farrell has entered the following ballot position for
draft-ietf-calext-extensions-04: No Objection

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introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
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https://datatracker.ietf.org/doc/draft-ietf-calext-extensions/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


I think it'd be a fine thing if the calext WG were to consider privacy
issues with caldav in general. As it'd probably be wrong to try get
all of that done in this one document, perhaps we could try and 
see if the WG have sufficient interest and cycles to take that on?

My previous discuss text (plus an additional point about images
is below.

- I think adding some privacy considerations to this would be good,
either as new text or via references.  Did the WG consider privacy
issues? Some that occur to me are:

   - names, descriptions and identifiers here are all ones that
     might allow (re)identification in unexpected ways

   - the UID property in particular probably ought be random and
     probably ought not be re-used for anything else, some RFC2119
     SHOULD statements about that would seem like they'd be good.

   - doing a refresh against a calendar at the expected frequency
     could be a good way to re-identify someone - if I can read the
     expected frequency and some IP address connects (even all over
     TLS) at about that regularity then I can be reasonably sure
     that the client is someone subscribed to that address, and
     maybe use that to track a person's movement across various
     networks. (That's different from the text in section 7 which
     assumes that the URL is what's tracked, but the connection
     can be just as revealing, for some calendars.)

I'm not trying to insist all that analysis be documented in this
draft but I would hope that the WG have considered the issues and
how best to document those and have a plan to do that. (If I'm told
such a plan exists and what it is, I'll clear.)

This is related to, but a little different from, Kathleen's discuss,
depending on the added privacy considerations text which I've not
managed to find in the secdir review thread.  But this should be as
easily cleared I'd guess.

And another possible issue now occurs to me: I remember that one
social network had an issue where all the avatar image sizes were
nearly unique, so that even though those were all accessed over TLS,
one could identify users and their buddies by watching those be
downloaded. (That depended on how the social network in question
made avatar images available, which'll likely be different here.)
But there may be a reason to recommend normalising image sizes here
as well and to encourage only offering those over https and not
http.



From nobody Wed Jun 29 09:42:29 2016
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Date: Wed, 29 Jun 2016 12:42:22 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
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Hi Stephen,

--On June 29, 2016 at 12:33:45 PM +0100 Stephen Farrell 
<stephen.farrell@cs.tcd.ie> wrote:

> And another possible issue now occurs to me: I remember that one
> social network had an issue where all the avatar image sizes were
> nearly unique, so that even though those were all accessed over TLS,
> one could identify users and their buddies by watching those be
> downloaded. (That depended on how the social network in question
> made avatar images available, which'll likely be different here.)
> But there may be a reason to recommend normalising image sizes here
> as well and to encourage only offering those over https and not
> http.

I will add the following to the first paragraph of the privacy section:

    In particular, calendar publishers
   wishing to help protect the privacy of their subscribers MUST use
   HTTP with Transport Layer Security [RFC7230] ("https:" URIs instead
   of "http:" URIs) for access to calendar data or ancillary data such
   as images.

> I'm sure folks who know calendaring much better that I do would
> likely come up with additional issues, and would certainly know
> better which are real concerns, and which aren't.

Will comment on this in a reply to your follow-up email.

-- 
Cyrus Daboo


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Date: Wed, 29 Jun 2016 12:48:34 -0400
From: Cyrus Daboo <cyrus@daboo.name>
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Hi Stephen,

--On June 29, 2016 at 5:37:14 PM +0100 Stephen Farrell 
<stephen.farrell@cs.tcd.ie> wrote:

>> Privacy issues were not specifically considered by the WG (in fact the
>> privacy section was only recently added).
>
> Ah ok. Is that something that needs further work, either here
> or perhaps better as a separate document that considers privacy
> issues with caldav? If so, do you think there might be folks
> who'd be interested in doing that work?
>
> I'm guessing that the answers might be "yes" and "umm, not
> sure" in that order:-)
>
> Anyway, I'll clear my discuss on this document and chat with
> Alexey tomorrow on the call (or via email is fine too) about
> the general issue and whether it's feasible to think about
> some folks doing work on that.

Yes this is ain interesting area to consider. The first question is how is 
calendar data any different from other types of data that may be accessed 
via authenticated or anonymous services (which ought to be covered by 
generic documents covering security and privacy for any data access 
protocol). Obviously there are unique aspects of calendar data that have to 
be considered and thus could be called out separately.

This is something that is becoming more and more important as we see much 
more public event use as well as event/calendar sharing in both enterprise 
and consumer services. There is a bunch of work on CalDAV-based calendar 
sharing that is starting to be discussed at the IETF and will hopefully 
make its way to a working group - so there will be plenty of opportunity to 
discuss this in more detail there.

>> Please review the current
>
> All of the above are good additions. (Did you see the additional
> point I raised about image size normalisation in a mail with
> Alexey? Including that too might be good.)

Yes, just dealt with that - processing IESG messages serially rather than 
in parallel :-)

-- 
Cyrus Daboo


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Date: Wed, 29 Jun 2016 12:50:42 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
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Subject: Re: [calsify] Kathleen Moriarty's Discuss on draft-ietf-calext-extensions-03: (with DISCUSS)
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Hi Kathleen,

--On June 29, 2016 at 10:10:32 AM -0400 Kathleen Moriarty 
<kathleen.moriarty.ietf@gmail.com> wrote:

>> New -04 version of the draft has now been posted.
>
> Thank you!  I'll look at it in a little while.

Just FYI the -04 privacy section has just had a number of 
additions/revisions in response to Stephen's comments. Here is a complete 
copy of what I currently have:

8.  Privacy Considerations

   Several of the new properties or parameters defined by this
   specification allow reference to "external" URIs.  Access to those
   URIs could be tracked, leading to loss of privacy.  Clients SHOULD
   ensure that suitable permission is granted by calendar users before
   such URIs are dereferenced.  In particular, calendar publishers
   wishing to help protect the privacy of their subscribers MUST use
   HTTP with Transport Layer Security [RFC7230] ("https:" URIs instead
   of "http:" URIs) for access to calendar data or ancillary data such
   as images.

   In general, users have to rely on the privacy policies of any
   conferencing system being accessed via the "CONFERENCE" property, for
   their own privacy protection.  It is entirely possible for such
   systems to uniquely identify and log the activity and participation
   (or not) of calendar users in the conference.  Calendar user agents
   SHOULD track which conferencing systems are used and warn users the
   first time a new one is about to be used.  This is particularly
   important if the client automatically "dials in" to the conference
   when the event start time occurs.

   By giving different calendar users different values for the "REFRESH-
   INTERVAL" property, it is possible for a publisher of calendar data
   to uniquely identify each refresh from each calendar users' clients,
   and thereby track user activity and IP address over time.  To address
   this, clients SHOULD add or subtract some random amount of time from
   the published "REFRESH-INTERVAL" value when doing actual refreshes.

   Privacy considerations in [RFC5545], and [RFC5546] MUST also be
   adhered to.


-- 
Cyrus Daboo


From nobody Wed Jun 29 09:57:45 2016
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From: Alexey Melnikov <alexey.melnikov@isode.com>
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Subject: Re: [calsify] Stephen Farrell's Discuss on draft-ietf-calext-extensions-03: (with DISCUSS)
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Hi Cyrus,


On 29/06/2016 17:20, Cyrus Daboo wrote:
> Hi Stephen,
> Please see the new -04 draft which has added a privacy section, and 
> also has changes to the security section.
>
> --On June 29, 2016 at 3:54:19 AM -0700 Stephen Farrell 
> <stephen.farrell@cs.tcd.ie> wrote:
>
>>    - the UID property in particular probably ought be random and
>>      probably ought not be re-used for anything else, some RFC2119
>>      SHOULD statements about that would seem like they'd be good.
>
> The definition of "UID" comes from 5545, which already states:
>
>    The "UID" itself MUST be a globally unique identifier.
>
> However, 5545 then goes on to suggest "good" ways to create it which 
> include use of domain and IP literals, which are clearly not 
> appropriate any more. So, given this draft is updating 5545, do we 
> want to correct that now by making a stronger statement that the UID 
> value should be "opaque"? My implementations just generate UUIDs - 
> perhaps that should be a new recommendation. If we want to do that, 
> then I would add additional text in section 5.3 as well as the privacy 
> section. But the question is whether it is appropriate for this draft 
> to attempt such a fix - I think that is something the working group 
> will need to comment on.

With no hats: as you already updating RFC 5545, you might as well add 
this text. But yes, I would like to hear comments from other 
implementors if they think your text is sensible or not.
(I think it is.)

Best Regards,
Alexey


From nobody Wed Jun 29 10:15:29 2016
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Subject: [calsify] Kathleen Moriarty's No Objection on draft-ietf-calext-extensions-04: (with COMMENT)
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Kathleen Moriarty has entered the following ballot position for
draft-ietf-calext-extensions-04: No Objection

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The document, along with other ballot positions, can be found here:
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thanks for the updated text to address the SecDir review and Stephen's
additional comments (I followed that discussion as well).



From nobody Wed Jun 29 10:17:12 2016
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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Wed, 29 Jun 2016 13:17:06 -0400
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Subject: Re: [calsify] Kathleen Moriarty's Discuss on draft-ietf-calext-extensions-03: (with DISCUSS)
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Thank you, Cyrus!

I was following Stephen's discuss and was happy with the text
proposed.  Thanks for being so responsive, it's really helpful!

On Wed, Jun 29, 2016 at 12:50 PM, Cyrus Daboo <cyrus@daboo.name> wrote:
> Hi Kathleen,
>
> --On June 29, 2016 at 10:10:32 AM -0400 Kathleen Moriarty
> <kathleen.moriarty.ietf@gmail.com> wrote:
>
>>> New -04 version of the draft has now been posted.
>>
>>
>> Thank you!  I'll look at it in a little while.
>
>
> Just FYI the -04 privacy section has just had a number of
> additions/revisions in response to Stephen's comments. Here is a complete
> copy of what I currently have:
>
> 8.  Privacy Considerations
>
>   Several of the new properties or parameters defined by this
>   specification allow reference to "external" URIs.  Access to those
>   URIs could be tracked, leading to loss of privacy.  Clients SHOULD
>   ensure that suitable permission is granted by calendar users before
>   such URIs are dereferenced.  In particular, calendar publishers
>   wishing to help protect the privacy of their subscribers MUST use
>   HTTP with Transport Layer Security [RFC7230] ("https:" URIs instead
>   of "http:" URIs) for access to calendar data or ancillary data such
>   as images.
>
>   In general, users have to rely on the privacy policies of any
>   conferencing system being accessed via the "CONFERENCE" property, for
>   their own privacy protection.  It is entirely possible for such
>   systems to uniquely identify and log the activity and participation
>   (or not) of calendar users in the conference.  Calendar user agents
>   SHOULD track which conferencing systems are used and warn users the
>   first time a new one is about to be used.  This is particularly
>   important if the client automatically "dials in" to the conference
>   when the event start time occurs.
>
>   By giving different calendar users different values for the "REFRESH-
>   INTERVAL" property, it is possible for a publisher of calendar data
>   to uniquely identify each refresh from each calendar users' clients,
>   and thereby track user activity and IP address over time.  To address
>   this, clients SHOULD add or subtract some random amount of time from
>   the published "REFRESH-INTERVAL" value when doing actual refreshes.
>
>   Privacy considerations in [RFC5545], and [RFC5546] MUST also be
>   adhered to.
>
>
> --
> Cyrus Daboo
>



-- 

Best regards,
Kathleen


From nobody Wed Jun 29 16:05:17 2016
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To: Alexey Melnikov <alexey.melnikov@isode.com>, Cyrus Daboo <cyrus@daboo.name>, Stephen Farrell <stephen.farrell@cs.tcd.ie>, The IESG <iesg@ietf.org>
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From: Ken Murchison <murch@andrew.cmu.edu>
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Subject: Re: [calsify] Stephen Farrell's Discuss on draft-ietf-calext-extensions-03: (with DISCUSS)
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Hi Alexey,


On 06/29/2016 12:57 PM, Alexey Melnikov wrote:
> Hi Cyrus,
>
>
> On 29/06/2016 17:20, Cyrus Daboo wrote:
>> Hi Stephen,
>> Please see the new -04 draft which has added a privacy section, and 
>> also has changes to the security section.
>>
>> --On June 29, 2016 at 3:54:19 AM -0700 Stephen Farrell 
>> <stephen.farrell@cs.tcd.ie> wrote:
>>
>>>    - the UID property in particular probably ought be random and
>>>      probably ought not be re-used for anything else, some RFC2119
>>>      SHOULD statements about that would seem like they'd be good.
>>
>> The definition of "UID" comes from 5545, which already states:
>>
>>    The "UID" itself MUST be a globally unique identifier.
>>
>> However, 5545 then goes on to suggest "good" ways to create it which 
>> include use of domain and IP literals, which are clearly not 
>> appropriate any more. So, given this draft is updating 5545, do we 
>> want to correct that now by making a stronger statement that the UID 
>> value should be "opaque"? My implementations just generate UUIDs - 
>> perhaps that should be a new recommendation. If we want to do that, 
>> then I would add additional text in section 5.3 as well as the 
>> privacy section. But the question is whether it is appropriate for 
>> this draft to attempt such a fix - I think that is something the 
>> working group will need to comment on.
>
> With no hats: as you already updating RFC 5545, you might as well add 
> this text. But yes, I would like to hear comments from other 
> implementors if they think your text is sensible or not.
> (I think it is.)

I'm comfortable recommending UUIDs.

-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University


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From: Daniel Migault <daniel.migault@ericsson.com>
To: "calsify@ietf.org" <calsify@ietf.org>
Thread-Topic: Call for Adoption
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Subject: [calsify] Call for Adoption
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Hi,

This starts a Call for Adoption for three drafts:
    - 1) CalDAV Managed Attachments [1]
    - 2) Improved Support for iCalendar Relationships
    - 3) Event Publishing Extensions to iCalendar:

The document is available here:
https://tools.ietf.org/id/draft-housley-cms-chacha20-poly1305-00.txt

Please review these drafts to see if you think it is suitable for adoption =
by CALEXT, and comment to the list, clearly stating your view.  *Speak Up* =
if you have strong opposition to this work.

This call for adoption ends on July 13.

BR,
Donald, Phillipp and Daniel

[1] http://tools.ietf.org/id/draft-daboo-caldav-attachments
[2] https://www.ietf.org/archive/id/draft-douglass-ical-relations-04.txt
[3] https://datatracker.ietf.org/doc/draft-douglass-calendar-extension/



[Ericsson]<http://www.ericsson.com/>

DANIEL MIGAULT
Researcher
Research

Ericsson
8500 Boulevard Decarie
H4P 2N2 Montreal, Canada
Phone +1 514 345 7900 46628
Mobile +1 514 452 2160
daniel.migault@ericsson.com
www.ericsson.com


[http://www.ericsson.com/current_campaign]<http://www.ericsson.com/current_=
campaign>

Legal entity: Ericsson Canada Inc., registered office in Montreal. This Com=
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<p class=3D"MsoNormal">Hi, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This starts a Call for Adoption for three drafts:<o:=
p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; - 1) CalDAV Managed Attachments [=
1]<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; - 2) Improved Support for iCalend=
ar Relationships<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; - 3) Event Publishing Extensions =
to iCalendar:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The document is available here:<o:p></o:p></p>
<p class=3D"MsoNormal">https://tools.ietf.org/id/draft-housley-cms-chacha20=
-poly1305-00.txt<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please review these drafts to see if you think it is=
 suitable for adoption by CALEXT, and comment to the list, clearly stating =
your view.&nbsp; *Speak Up* if you have strong opposition to this work.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This call for adoption ends on July 13.<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">BR, <o:p></o:p></p>
<p class=3D"MsoNormal">Donald, Phillipp and Daniel <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">[1] http://tools.ietf.org/id/draft-daboo-caldav-atta=
chments<o:p></o:p></p>
<p class=3D"MsoNormal">[2] https://www.ietf.org/archive/id/draft-douglass-i=
cal-relations-04.txt<o:p></o:p></p>
<p class=3D"MsoNormal">[3] https://datatracker.ietf.org/doc/draft-douglass-=
calendar-extension/<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><a href=3D"http://www=
.ericsson.com/" target=3D"_blank"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Arial&quot;,&quot;sans-serif&quot;;color:blue;text-decoration:none=
"><img border=3D"0" width=3D"68" height=3D"60" id=3D"_x0000_i1026" src=3D"c=
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=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">=
<br>
<br>
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;;color:#333333">DANIEL MIGAULT
</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&q=
uot;sans-serif&quot;;color:#333333"><br>
Researcher <br>
Research</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New =
Roman&quot;,&quot;serif&quot;;color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;;color:#333333"><br>
</span><b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&qu=
ot;sans-serif&quot;;color:#333333">Ericsson</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#3333=
33"><br>
8500 Boulevard Decarie<br>
H4P 2N2 Montreal, Canada<br>
Phone &#43;1 514 345 7900 46628<br>
Mobile &#43;1 514 452 2160<br>
daniel.migault@ericsson.com<br>
www.ericsson.com </span><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,&quot;serif&quot;;color:#333333"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Ari=
al&quot;,&quot;sans-serif&quot;"><br>
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k"><span style=3D"font-size:9.0pt;font-family:&quot;Arial&quot;,&quot;sans-=
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mes New Roman&quot;,&quot;serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:8.0pt;font-family:&quot;Ari=
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We only send and receive email on the basis of the terms
 set out at <a href=3D"http://www.ericsson.com/email_disclaimer" title=3D"h=
ttp://www.ericsson.com/email_disclaimer">
<span style=3D"color:blue">www.ericsson.com/email_disclaimer</span></a> </s=
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--_005_2DD56D786E600F45AC6BDE7DA4E8A8C117F27750eusaamb107erics_--


From nobody Thu Jun 30 05:49:33 2016
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From: Daniel Migault <daniel.migault@ericsson.com>
To: "calsify@ietf.org" <calsify@ietf.org>
Thread-Topic: Call for Adoption
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Subject: Re: [calsify] Call for Adoption
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-- ignore previous message=20

Hi,=20

This starts a Call for Adoption for three drafts:
=A0=A0=A0 - 1) CalDAV Managed Attachments [1]
=A0=A0=A0 - 2) Improved Support for iCalendar Relationships [2]
=A0=A0=A0 - 3) Event Publishing Extensions to iCalendar [3]

Please review these drafts to see if you think it is suitable for adoption =
by CALEXT, and comment to the list, clearly stating your view.=A0 *Speak Up=
* if you have strong opposition to this work.

This call for adoption ends on July 13.

BR,=20
Donald, Phillipp and Daniel=20

[1] http://tools.ietf.org/id/draft-daboo-caldav-attachments
[2] https://www.ietf.org/archive/id/draft-douglass-ical-relations-04.txt
[3] https://datatracker.ietf.org/doc/draft-douglass-calendar-extension/



From: Daniel Migault=20
Sent: Thursday, June 30, 2016 3:44 PM
To: 'calsify@ietf.org'
Cc: calext-chairs@tools.ietf.org
Subject: Call for Adoption

Hi,=20

This starts a Call for Adoption for three drafts:
=A0=A0=A0 - 1) CalDAV Managed Attachments [1]
=A0=A0=A0 - 2) Improved Support for iCalendar Relationships
=A0=A0=A0 - 3) Event Publishing Extensions to iCalendar:

The document is available here:
https://tools.ietf.org/id/draft-housley-cms-chacha20-poly1305-00.txt

Please review these drafts to see if you think it is suitable for adoption =
by CALEXT, and comment to the list, clearly stating your view.=A0 *Speak Up=
* if you have strong opposition to this work.

This call for adoption ends on July 13.

BR,=20
Donald, Phillipp and Daniel=20

[1] http://tools.ietf.org/id/draft-daboo-caldav-attachments
[2] https://www.ietf.org/archive/id/draft-douglass-ical-relations-04.txt
[3] https://datatracker.ietf.org/doc/draft-douglass-calendar-extension/




DANIEL MIGAULT=20
Researcher=20
Research

Ericsson
8500 Boulevard Decarie
H4P 2N2 Montreal, Canada
Phone +1 514 345 7900 46628
Mobile +1 514 452 2160
daniel.migault@ericsson.com
www.ericsson.com=20




Legal entity: Ericsson Canada Inc., registered office in Montreal. This Com=
munication is Confidential. We only send and receive email on the basis of =
the terms set out at www.ericsson.com/email_disclaimer=20


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From: Ken Murchison <murch@andrew.cmu.edu>
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Subject: Re: [calsify] Call for Adoption
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I support adopting all three of these drafts.



On 06/30/2016 08:44 AM, Daniel Migault wrote:
>
> Hi,
>
> This starts a Call for Adoption for three drafts:
>
>     - 1) CalDAV Managed Attachments [1]
>
>     - 2) Improved Support for iCalendar Relationships
>
>     - 3) Event Publishing Extensions to iCalendar:
>
> The document is available here:
>
> https://tools.ietf.org/id/draft-housley-cms-chacha20-poly1305-00.txt
>
> Please review these drafts to see if you think it is suitable for 
> adoption by CALEXT, and comment to the list, clearly stating your 
> view.  *Speak Up* if you have strong opposition to this work.
>
> This call for adoption ends on July 13.
>
> BR,
>
> Donald, Phillipp and Daniel
>
> [1] http://tools.ietf.org/id/draft-daboo-caldav-attachments
>
> [2] https://www.ietf.org/archive/id/draft-douglass-ical-relations-04.txt
>
> [3] https://datatracker.ietf.org/doc/draft-douglass-calendar-extension/
>
> Ericsson <http://www.ericsson.com/>
>
> *DANIEL MIGAULT *
> Researcher
> Research
>
>
> *Ericsson*
> 8500 Boulevard Decarie
> H4P 2N2 Montreal, Canada
> Phone +1 514 345 7900 46628
> Mobile +1 514 452 2160
> daniel.migault@ericsson.com
> www.ericsson.com
>
>
>
> http://www.ericsson.com/current_campaign 
> <http://www.ericsson.com/current_campaign>
>
> Legal entity: Ericsson Canada Inc., registered office in Montreal. 
> This Communication is Confidential. We only send and receive email on 
> the basis of the terms set out at www.ericsson.com/email_disclaimer 
> <http://www.ericsson.com/email_disclaimer>
>
>
>
> _______________________________________________
> calsify mailing list
> calsify@ietf.org
> https://www.ietf.org/mailman/listinfo/calsify

-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University


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    I support adopting all three of these drafts.<br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 06/30/2016 08:44 AM, Daniel Migault
      wrote:<br>
    </div>
    <blockquote
cite="mid:2DD56D786E600F45AC6BDE7DA4E8A8C117F27750@eusaamb107.ericsson.se"
      type="cite">
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      <div class="WordSection1">
        <p class="MsoNormal">Hi, <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">This starts a Call for Adoption for three
          drafts:<o:p></o:p></p>
        <p class="MsoNormal">    - 1) CalDAV Managed Attachments [1]<o:p></o:p></p>
        <p class="MsoNormal">    - 2) Improved Support for iCalendar
          Relationships<o:p></o:p></p>
        <p class="MsoNormal">    - 3) Event Publishing Extensions to
          iCalendar:<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">The document is available here:<o:p></o:p></p>
        <p class="MsoNormal"><a class="moz-txt-link-freetext" href="https://tools.ietf.org/id/draft-housley-cms-chacha20-poly1305-00.txt">https://tools.ietf.org/id/draft-housley-cms-chacha20-poly1305-00.txt</a><o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Please review these drafts to see if you
          think it is suitable for adoption by CALEXT, and comment to
          the list, clearly stating your view.  *Speak Up* if you have
          strong opposition to this work.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">This call for adoption ends on July 13.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">BR, <o:p></o:p></p>
        <p class="MsoNormal">Donald, Phillipp and Daniel <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">[1]
          <a class="moz-txt-link-freetext" href="http://tools.ietf.org/id/draft-daboo-caldav-attachments">http://tools.ietf.org/id/draft-daboo-caldav-attachments</a><o:p></o:p></p>
        <p class="MsoNormal">[2]
          <a class="moz-txt-link-freetext" href="https://www.ietf.org/archive/id/draft-douglass-ical-relations-04.txt">https://www.ietf.org/archive/id/draft-douglass-ical-relations-04.txt</a><o:p></o:p></p>
        <p class="MsoNormal">[3]
          <a class="moz-txt-link-freetext" href="https://datatracker.ietf.org/doc/draft-douglass-calendar-extension/">https://datatracker.ietf.org/doc/draft-douglass-calendar-extension/</a><o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-bottom:12.0pt"><a
            moz-do-not-send="true" href="http://www.ericsson.com/"
            target="_blank"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:blue;text-decoration:none"><img
                id="_x0000_i1026"
                src="cid:part1.05040400.09000606@andrew.cmu.edu"
                alt="Ericsson" border="0" height="60" width="68"></span></a><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><br>
            <br>
          </span><span style="font-size:12.0pt;font-family:&quot;Times
            New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p>
        <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#333333">DANIEL
              MIGAULT
            </span></b><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#333333"><br>
            Researcher <br>
            Research</span><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;;color:#333333"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;;color:#333333"><br>
          </span><b><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#333333">Ericsson</span></b><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#333333"><br>
            8500 Boulevard Decarie<br>
            H4P 2N2 Montreal, Canada<br>
            Phone +1 514 345 7900 46628<br>
            Mobile +1 514 452 2160<br>
            <a class="moz-txt-link-abbreviated" href="mailto:daniel.migault@ericsson.com">daniel.migault@ericsson.com</a><br>
            <a class="moz-txt-link-abbreviated" href="http://www.ericsson.com">www.ericsson.com</a> </span><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;;color:#333333"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:9.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><br>
            <br>
          </span><a moz-do-not-send="true"
            href="http://www.ericsson.com/current_campaign"
            target="_blank"><span
style="font-size:9.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:blue;text-decoration:none"><img
                id="_x0000_i1025"
                src="cid:part3.03010409.02090501@andrew.cmu.edu"
                alt="http://www.ericsson.com/current_campaign"
                border="0" height="80" width="500"></span></a><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:8.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#333333">Legal
            entity: Ericsson Canada Inc., registered office in Montreal.
            This Communication is Confidential. We only send and receive
            email on the basis of the terms set out at <a
              moz-do-not-send="true"
              href="http://www.ericsson.com/email_disclaimer"
              title="http://www.ericsson.com/email_disclaimer">
              <span style="color:blue"><a class="moz-txt-link-abbreviated" href="http://www.ericsson.com/email_disclaimer">www.ericsson.com/email_disclaimer</a></span></a>
          </span><o:p></o:p></p>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
calsify mailing list
<a class="moz-txt-link-abbreviated" href="mailto:calsify@ietf.org">calsify@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/calsify">https://www.ietf.org/mailman/listinfo/calsify</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University
</pre>
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