W3C home > Mailing lists > Public > public-wai-ert@w3.org > May 2005

Re: more properties for the location class (was Re: locating assertions in non-text based formats)

From: Charles McCathieNevile <charles@sidar.org>
Date: Sun, 01 May 2005 13:50:36 +0200
To: shadi@w3.org, public-wai-ert@w3.org
Message-ID: <op.sp3humyjw5l938@pc048.qadoc.oslo.opera.com>

On Thu, 28 Apr 2005 15:56:14 +0200, Shadi Abou-Zahra <shadi@w3.org> wrote:

> Based on Christophe's findings in PDF and Flash, I suggest adding the
> following properties to earl:location (which is still in discussion
> itself):
> * earl:page - to help describe the location in word processor formats
> * earl:frame - to help describe the location in frame-based formats (eg.
> multimedia presentations)
> * earl:time - to help describe the location in a time-based format (eg.
> audio files)

Hmmm. First thing is that we have a location property and a Location class  
proposed. As can be seen, it is too easy to confuse the two - I suggest  
something like location and TheLocator as URI endings - it is still  
possible to get confused, especially for people who aren't used to the  
class/property model, but at least you can see that they are different and  
which one you have.

In Word documents there is a bookmark function (more or less equivalent to  
a Xpointer I guess) - why wouldn't we usee that if we were going to point  
into them.

Multimedia presentations can easily be wrapped in SMIL. This means that it  
is more or less always possible to do this as a way of constructing an XML  
pointer - for time, location, a moving location over time, etc. I think we  
should suggest this technique rather than rewriting SMIL in earl. Danbri  
adn I did some work on this a few years ago - I think we published the SVG  
stuff (abouit identifying a particular object within the image - Jim Ley  
has made nice demos based on the technique although they are nothing to do  
with EARL. Have a look at http://www.w3.org/2001/08/rdfweb/svg-foaf.html  
for an idea of how to do this...



Charles McCathieNevile                      Fundacion Sidar
charles@sidar.org   +61 409 134 136    http://www.sidar.org
Received on Sunday, 1 May 2005 11:50:44 UTC

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