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Re: associating a group of related images to a common caption

From: Simon Pieters <simonp@opera.com>
Date: Mon, 14 Jun 2010 22:38:25 +0200
To: public-html-a11y@w3.org, wai-xtech@w3.org, "Gregory J. Rosmaita" <oedipus@hicom.net>
Message-ID: <op.vea4ybynidj3kv@simon-pieterss-macbook.local>
On Mon, 14 Jun 2010 18:03:27 +0200, Gregory J. Rosmaita  
<oedipus@hicom.net> wrote:

> aloha!
>
> currently, the HTML5 draft contains the following example:
>
> QUOTE
>
> <figure>
> <img src="castle1423.jpeg" title="Etching. Anonymous, ca. 1423."
> alt="The castle has one tower, and a tall wall around it.">
>
> <img src="castle1858.jpeg" title="Oil-based paint on canvas. Maria Towle,
> 1858."
> alt="The castle now has two towers and two walls.">
>
> <img src="castle1999.jpeg" title="Film photograph. Peter Jankle, 1999."
> alt="The castle lies in ruins, the original tower all that remains in one
> piece.">
>
> <figcaption>The castle through the ages: 1423, 1858, and 1999,
> respectively</figcaption>
> </figure>
>
> UNQUOTE
>
> when what is needed is:
>
> <figure>
> <figcaption imgref="castle1423 castle1858 castle1999">
> The castle through the ages: 1423, 1858, and 1999.
> </figcaption>
>
> <img src="castle1423.jpeg" title="Etching. Anonymous, ca. 1423."
> alt="Engraving of the castle, circa 1423, shows one tower with a tall
> wall around it.">
>
> <img src="castle1858.jpeg" title="Oil-based paint on canvas. Maria Towle,
> 1858."
> alt="The castle as it appeared in 1858, with two towers and two walls.">
>
> <img src="castle1999.jpeg" title="Film photograph. Peter Jankle, 1999."
> alt="Photograph from 1999; the castle lies in ruins, only the original
> tower remains intact.">
> </figure>
>
> note the added attribute "imgref" for FIGCAPTION -- this is intended to
> provide a strong binding between the individual components of the
> illustration and the caption which describes the images as a group --
> this is a space delimited list
>
> note that the @imgref attribute is part of the "Structure Guidelines for
> DAISY/NISO":
>
> http://www.daisy.org/z3986/structure/archive-SG-DAISY2005/part2-image.htm
>
> note, also that the DAISY structure guidelines also uses an attribute
> named "prodnote"
>
> QUOTE
> multiple <prodnote>s if different versions are needed for different media
> (e.g., large print, braille, or print). If several <prodnote>s refer to a
> single <img> with id="xxx", each prodnote would have the same <prodnote
> imgref="xxx"> but each <prodnote> would have a different value for the
> showin attribute to control which media it is displayed in. See
> Information Object: Producer's Note in Part II(b): Block Elements. If
> multiple <prodnote>s refer to a group of images, the imgref attribute
> would include the ids of all images in that group, e.g., <prodnote
> imgref="id1 id2 id3 ...">.
> UNQUOTE
>
> in this model, the imgref attribute is applicable to both the FIGCAPTION
> and the PRODNOTE (which can be "viewed" as a block-level longdescription
> available on user request or in compliance with user-settings (it has a
> default value of render="optional"); obviously the term "prodnote"
> connotes something different than LONGDESC, but it is a potential model
> as to how to get LONGDESC info into the DOM without a fetch from an
> external resource...
>
> how to approach?  should i first file a bug on image grouping that
> simply states:
>
> PROPOSED BUG
> For the purposes of grouping and labelling individual images in a
> compound image (that is, a FIGURE containing multiple IMGs with a
> common FIGCAPTION), it is necessary to introduce a new attribute,
> "imgref", which can be used to associate individual IMG declarations
> with a FIGCAPTION, using a space delimited list.
>
> <FIGURE>
> <FIGCAPTION imgref="img1 img2 img3">Caption Text for Figure</FIGCAPTION>
> <IMG src="img1.png" alt="Alternative text for image 1">
> <IMG src="img2.png" alt="Alternative text for image 2">
> <IMG src="img3.png" alt="Alternative text for image 3">
> </FIGURE>
>
> END PROPOSED BUG
>
> thoughts?  next steps?  gregory.

The images are already associated with the caption, thanks to <figure> and  
<figcaption>.

-- 
Simon Pieters
Opera Software
Received on Monday, 14 June 2010 20:39:33 GMT

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