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Re: TT telecon - agenda for 5 Dec

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Thu, 4 Dec 2008 23:08:44 +1100
Message-ID: <2c0e02830812040408qbabf345o90ac00fa2668b0c5@mail.gmail.com>
To: "David Kirby" <david.kirby@rd.bbc.co.uk>
Cc: public-tt@w3.org


If I may, I'd like to contribute some information to the xml:id vs id

I am aware that most players by now support xml:id, and that this may
be regarded as a reason to keep it in the spec.

However, I have had feedback from another person looking to use DFXP
for subtitles in Web video. Here is what he wrote:

"xml:id support in Gecko was attempted but it was pulled due to
performance issues. xml:id support has explicitly been decided against
in WebKit. The problem with xml:id on the general level is that it
breaks the assumption that an element can have only one ID attribute.
xml:id has already turned out to be more complex than expected for the
HTML5 Validator.nu. Currently, it seems that xml:id is falling out of
favor when it comes to browser-targeted XML vocabularies. (I'd prefer
DFXP to use an element called 'id' in no namespace instead of xml:id.
However, if at this point existing implementations support xml:id, it
may be better to stick to xml:id as the *only* way--since having two
ways is the problem--as long as xml:id isn't leaked to the
general-purpose Gecko DOM e.g. through a scripting API.)"

I would support removing xml:id - in fact, I would support removing
the use of namespaces where possible. It will make implementation much
more lightweight. But that's a different discussion altogether.

Best Regards,

On Thu, Dec 4, 2008 at 8:45 PM, David Kirby <david.kirby@rd.bbc.co.uk> wrote:
> Here's the agenda for tomorrow's meeting.
> David
> =============
> TT agenda for Friday 5th Dec 2008
> Time: 10am Eastern, 3pm UK, 7am Pacific.
> 1) Review action items
> www.w3.org/AudioVideo/TT/tracker/actions/open
> 2) Issues arising
>    www.w3.org/AudioVideo/TT/tracker/issues/open
> [Plus:
> a) Spec needs to say that user agent must define a default region (replaces
> action item 15)
> b) Spec needs to say that a dfxp file containing only timing and text will
> be displayed by a UA.
> c) tts:textDecoration should be "lineThrough" and "noLineThrough" (Geoff's
> email)
> d) allow both xml:id and id?
> e) Support for multiple languages (i.e. xml:lang on div?) ]
> 3) Proposed survey of issues
> 4) Progress with testing
>  - xml:space (clarify behaviour)
>  - Any other issues arising from the testing?
> 5) dynamicFlow
> 6) SMPTE
> 7) AOB
Received on Thursday, 4 December 2008 12:09:19 UTC

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