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Subject: RE: [Widex] suggestions re timestamps
Date: Mon, 3 Apr 2006 21:06:30 +0300
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From: <Vlad.Stirbu@nokia.com>
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Dave,

I agree with your proposal to define the timestamp as "non-negative
integer denoting the number of milliseconds from the current reference
point". This can be considered as good baseline for processing time
stamps which probably suits most environments.

Looking at how REX is defining the meaning of the timestamp (e.g. "an
integer in milliseconds relative to the epoch") I noticed that the
format is the same (e.g. an integer) and only the processing model is
different. The difference between the Widex proposal and the REX model
is that Widex has relative reference point while REX has absolute
reference point (e.g. 00:00:00 UTC 1st January 1970).

There are good reasons for using relative and absolute reference points
depending on the deploying environment. In order to better accommodate
these environments, the Widex framework can make use of the Service
Discovey component to enable the Widex Renderer and the Widex Server to
negociate and agree on a common processing model for the timestamp.
Thus, we can consider that the relative reference point is the default
processing model for timestamps but more demanding environments (e.g.
MORE - where streaming is involved) can use the absolute reference point
as defined by REX.

In addition, by negociating the processing model for the timestamp
during service discovery step, we allow particular environments to
deploy their own processing models, which could be undefined at this
time, without affecting the core Widex framework.

Vlad

>-----Original Message-----
>From: ext Dave Raggett [mailto:dsr@w3.org]=20
>Sent: 24 March, 2006 19:15
>To: widex@ietf.org
>Subject: [Widex] suggestions re timestamps
>
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>In the face to face meeting on Thursday, we discussed the=20
>potential problems with how REX specifies timestamps for=20
>updates that are intended to be applied at a future time.
>
>REX currently specifies these in terms of the renderer's clock=20
>as milliseconds since the start of 1970 GMT. The problem is=20
>the likelihood of a significant clock skew between the=20
>renderer and the server, and the latency incurred by the=20
>protocol. This makes it difficult to the server to set the=20
>appropriate timestamps when the update is to be applied in a=20
>relatively short time interval into the future.
>
>In principle, the server may be able to estimate the clock=20
>skew and the network latency from a sequence of interactions=20
>with the renderer, but this is tricky and subject to uncertainties.
>
>W3C's SMIL language deals with this by allowing you to specify=20
>event timestamps in terms off timed offsets from other events=20
>(the beginning or end of a give presentation). SMIL isn't=20
>itself a solution to Widex as it doesn't deal with the means=20
>to transport DOM events and updates.
>
>Widex/REX could use the SMIL event-value syntax, which=20
>includes a reference to a named event and a signed time=20
>offset. This would be very general, but comes with an=20
>implementation overhead that may not be acceptable in all=20
>environments. A simpler approach would be use non-negative=20
>timed offsets from an implicit reference event. You would be=20
>able to designate that a given event is the new reference=20
>point, replacing the previous reference point. The initial=20
>reference point is the start of the session.
>
>This technique avoids the need to record the times of events=20
>as they are applied. You only need to record the time of the=20
>current reference point. The syntax for identifying an event=20
>as a reference point would involve a new attribute. The=20
>existing timestamp would be refined as a non-negative integer=20
>denoting the number of milliseconds from the current reference point.
>
>For multimedia presentations, the audio track is often used as=20
>the reference timebase since human perception finds disruption=20
>to the audio more disturbing than to the visual presentation.
>A question for the W3C REX task force is whether they are=20
>interested in synchronizing SVG updates to streaming audio,=20
>and if so whether the presentation can be paused/resumed. If=20
>yes, then this should be taken into account in the semantics=20
>for timestamps, e.g. the clock should be paused along with the=20
>presentation.
>
>Comments?
>
>
>  Dave Raggett <dsr@w3.org>  W3C lead for multimodal interaction
>  http://www.w3.org/People/Raggett +44 1225 866240 (or 867351)
>
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Hi,

Updated version of the Widex requirements draft 01 available at
http://www.kolumbus.fi/vlad.stirbu/draft-ietf-widex-requirements-01.txt.
It will be available shortly also in the IETF drafts repository.

The draft addresses the comments raised during IETF65:

* Dean: Can we have multiple Widex sessions between client and server?
That would require more than just URI.  Dave: Assuming single=20
session. Need to document.
	- Addressed in section 3.6

* Lisa: Strongly suggest making which DOM to modify explicit, not
implicit.
	- Addressed in section 5.3

* Need to get clarity from REX folks on DOM3 and QNames.  We could work
around it by specifying namespaces as a separate attribute or element.
	- TODO for the framework

* Need to do addressing (identifying session and DOM tree) in the
protocol.  Need to put this into the framework.
	- TODO for the framework

* We cannot have all DOM events get transferred over-the-wire. Need to
figure out how to specify what DOM events at the client get the server
gets notified of.  Is it by provisioning (i.e., this application has
these events) or by negotiation?
	- See next bullet.

* Should UI events that do not update the DOM get propagated via Widex
or the application, such as input focus, text selection, cursor
position? Vlad thinks they should be left out.  Dave: Someone needs to
deal with it, but it could be external to Widex.  Vlad: Widex needs to
communicate stuff that is relevant to modality.  Dave: These are
application events, not strictly UI events.
	- Addressed in section 5.3

* Add requirement for not reporting all DOM events from the renderer.
	- Addressed in section 3.3 in the WO.Event definition.

Cheers,
Vlad

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
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<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Dus-ascii">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
6.5.7650.21">
<TITLE>Updated Widex requirements draft</TITLE>
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<!-- Converted from text/rtf format -->

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">Hi,</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">Updated version of =
the Widex requirements draft 01 available at </FONT><A =
HREF=3D"http://www.kolumbus.fi/vlad.stirbu/draft-ietf-widex-requirements-=
01.txt"><U></U><U><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Verdana">http://www.kolumbus.fi/vlad.stirbu/draft-ietf-widex-requ=
irements-01.txt</FONT></U></A><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Verdana">. It will be available shortly also in the IETF drafts =
repository.</FONT></P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">The draft addresses =
the comments raised during IETF65:</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* Dean: Can we have =
multiple Widex sessions between client and server? That would require =
more than just URI.&nbsp; Dave: Assuming single </FONT></P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">session. Need to =
document.</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- Addressed in section 3.6</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* Lisa: Strongly =
suggest making which DOM to modify explicit, not implicit.</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- Addressed in section 5.3</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* Need to get =
clarity from REX folks on DOM3 and QNames.&nbsp; We could work around it =
by specifying namespaces as a separate attribute or element.</FONT></P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- TODO for the framework</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* Need to do =
addressing (identifying session and DOM tree) in the protocol.&nbsp; =
Need to put this into the framework.</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- TODO for the framework</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* We cannot have =
all DOM events get transferred over-the-wire. Need to figure out how to =
specify what DOM events at the client get the server gets notified =
of.&nbsp; Is it by provisioning (i.e., this application has these =
events) or by negotiation?</FONT></P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- See next bullet.</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* Should UI events =
that do not update the DOM get propagated via Widex or the application, =
such as input focus, text selection, cursor position? Vlad thinks they =
should be left out.&nbsp; Dave: Someone needs to deal with it, but it =
could be external to Widex.&nbsp; Vlad: Widex needs to communicate stuff =
that is relevant to modality.&nbsp; Dave: These are application events, =
not strictly UI events.</FONT></P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- Addressed in section 5.3</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">* Add requirement =
for not reporting all DOM events from the renderer.</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Verdana">- Addressed in section 3.3 in the WO.Event =
definition.</FONT>
</P>

<P><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">Cheers,</FONT>

<BR><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Verdana">Vlad</FONT>
</P>

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From widex-bounces@ietf.org Tue Apr 11 22:02:21 2006
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   Hi,
   A minor (maybe) fix: at the following section (3.4), in the Widex 
requirements draft 01, where there is a reference to "RUIOs", maybe 
should be "WOs" (Widex Objects).

"3.4.  Transport Protocol

   The Transport Protocol is a protocol that just transports the RUIOs
   as a string of bits, without looking at them."

-- 
Rosfran Borges

ext widex-bounces@ietf.org wrote:

> Hi,
>
> Updated version of the Widex requirements draft 01 available at 
> _http://www.kolumbus.fi/vlad.stirbu/draft-ietf-widex-requirements-01.txt_. 
> It will be available shortly also in the IETF drafts repository.
>
> The draft addresses the comments raised during IETF65:
>
> * Dean: Can we have multiple Widex sessions between client and server? 
> That would require more than just URI.  Dave: Assuming single
>
> session. Need to document.
>         - Addressed in section 3.6
>
> * Lisa: Strongly suggest making which DOM to modify explicit, not 
> implicit.
>         - Addressed in section 5.3
>
> * Need to get clarity from REX folks on DOM3 and QNames.  We could 
> work around it by specifying namespaces as a separate attribute or 
> element.
>
>         - TODO for the framework
>
> * Need to do addressing (identifying session and DOM tree) in the 
> protocol.  Need to put this into the framework.
>         - TODO for the framework
>
> * We cannot have all DOM events get transferred over-the-wire. Need to 
> figure out how to specify what DOM events at the client get the server 
> gets notified of.  Is it by provisioning (i.e., this application has 
> these events) or by negotiation?
>
>         - See next bullet.
>
> * Should UI events that do not update the DOM get propagated via Widex 
> or the application, such as input focus, text selection, cursor 
> position? Vlad thinks they should be left out.  Dave: Someone needs to 
> deal with it, but it could be external to Widex.  Vlad: Widex needs to 
> communicate stuff that is relevant to modality.  Dave: These are 
> application events, not strictly UI events.
>
>         - Addressed in section 5.3
>
> * Add requirement for not reporting all DOM events from the renderer.
>         - Addressed in section 3.3 in the WO.Event definition.
>
> Cheers,
> Vlad
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Widex mailing list
>Widex@ietf.org
>https://www1.ietf.org/mailman/listinfo/widex
>  
>


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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Widget Description Exchange Service Working Group of the IETF.

	Title		: Widget Description Exchange Service (WIDEX) Requirements
	Author(s)	: V. Stirbu, D. Raggett
	Filename	: draft-ietf-widex-requirements-01.txt
	Pages		: 14
	Date		: 2006-4-12
	
This document defines functional requirements for a framework and a
   protocol used to support XML-based user interfaces, where the user
   interface and application logic may be on different machines, and
   coupled via an exchange of XML DOM events and update/mutation
   operations.

A URL for this Internet-Draft is:
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From widex-bounces@ietf.org Thu Apr 13 16:43:50 2006
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Draft minutes for WIDEX at IETF 65 have been posted at:

http://www3.ietf.org/proceedings/06mar/minutes/widex.txt

Please review and report any issues to me.

Thanks,

--
Dean Willis
You Humble Footstool, as I Haven't Back Enough To Be A Chair

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From widex-bounces@ietf.org Tue Apr 25 15:58:15 2006
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	draft-ietf-widex-requirements-01.txt
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I'd like to request that the WIDEX working group commence last call  
on our requirements draft:

http://www.ietf.org/internet-drafts/draft-ietf-widex-requirements-01.txt

Please copy all comments to the list and to the authors directly.

I'd like to conclude WGLC by May 15, 2006.

So what does this mean? Since it's our first WGLC, let's talk about it:

First, everybody participating in the working group needs to read the  
draft carefully, even if they don't care much about the topic.

Do we agree with the requirements listed? Are there any requirements  
that we know of that aren't listed? Is the text clear, concise, and  
well-worded? Is everything spelled right? Are the right documents  
referenced? Are all the referenced documents needed?

Note: IDNITS says:

   - Unused Reference: [RFC4213] is defined on line 511, but not  
referenced
	'   [RFC4213]  Nordmark, E. and R. Gilligan, "Basic Transition  
Mechanisms'

so it's possible that not all the referenced documents are needed, or  
vice-versa.


One of the tricky parts with lightly-attended working groups is  
making sure that review has been sufficient. Would anyone (who is not  
an author of this draft) be willing to write up a review of the  
draft? Please volunteer . . . It would be even better to have two  
designated reviewers.

Thanks,

--
Dean Willis
chair, WIDEX


_______________________________________________
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https://www1.ietf.org/mailman/listinfo/widex



From widex-bounces@ietf.org Sat Apr 29 23:26:15 2006
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Message-ID: <44542C47.2010906@indt.org.br>
Date: Sun, 30 Apr 2006 00:17:27 -0300
From: Rosfran Lins Borges <rosfran.borges@indt.org.br>
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	Requirements:	draft-ietf-widex-requirements-01.txt
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  Hi,
  I want to be a volunteer on writing this review to the IETF Widex 
draft. I have been following all the Widex document releases, since the 
time it had been started (I had studied the later LRDP draft too, 
another standard released by Vlad Stirbu last year on IETF), and did 
read some another RUI architectures. So, it will be a pleasure to 
contribute to this standard!

Thanks,
Rosfran Borges


ext Dean Willis wrote:

> I'd like to request that the WIDEX working group commence last call  
> on our requirements draft:
>
> http://www.ietf.org/internet-drafts/draft-ietf-widex-requirements-01.txt
>
> Please copy all comments to the list and to the authors directly.
>
> I'd like to conclude WGLC by May 15, 2006.
>
> So what does this mean? Since it's our first WGLC, let's talk about it:
>
> First, everybody participating in the working group needs to read the  
> draft carefully, even if they don't care much about the topic.
>
> Do we agree with the requirements listed? Are there any requirements  
> that we know of that aren't listed? Is the text clear, concise, and  
> well-worded? Is everything spelled right? Are the right documents  
> referenced? Are all the referenced documents needed?
>
> Note: IDNITS says:
>
>   - Unused Reference: [RFC4213] is defined on line 511, but not  
> referenced
>     '   [RFC4213]  Nordmark, E. and R. Gilligan, "Basic Transition  
> Mechanisms'
>
> so it's possible that not all the referenced documents are needed, or  
> vice-versa.
>
>
> One of the tricky parts with lightly-attended working groups is  
> making sure that review has been sufficient. Would anyone (who is not  
> an author of this draft) be willing to write up a review of the  
> draft? Please volunteer . . . It would be even better to have two  
> designated reviewers.
>
> Thanks,
>
> -- 
> Dean Willis
> chair, WIDEX
>
>
> _______________________________________________
> Widex mailing list
> Widex@ietf.org
> https://www1.ietf.org/mailman/listinfo/widex



-- 
Rosfran Lins Borges
Engenheiro de Software
Instituto Nokia de Tecnologia - INdT/Recife


_______________________________________________
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https://www1.ietf.org/mailman/listinfo/widex



