- From: Glenn Adams via GitHub <sysbot+gh@w3.org>
- Date: Fri, 27 Sep 2019 09:27:43 +0000
- To: public-tt@w3.org
skynavga has just created a new issue for https://github.com/w3c/imsc:
== Usage pattern for specifying an image's alternate text. ==
IMSC1.1 [1] states that
>A `div` element that contains a child `image` element SHOULD contain a `metadata` element containing an `altText` named metadata item that is a Text Alternative of the image resource referenced by the `image` element.
This is inconsistent with the intended usage shown in TTML2 [2], which would have
```
<div>
<image ...>
<ttm:item name="altText">Alternate Text</ttm:item>
</image>
</div>
```
instead of the current recommendation which would have
```
<div>
<metadata>
<ttm:item name="altText">Alternate Text</ttm:item>
</metadata>
<image .../>
</div>
```
The problem with this latter usage is that the alternate text is not semantically associated (by document structure) with the `image`, but instead, with the `div`.
Apparently I did not catch this earlier when IMSC1.1 was being published. I would suggest this be addressed in IMSC1.2 by deprecating the current recommendation in favor of a new recommendation based on the first usage example shown above.
[1] https://www.w3.org/TR/ttml-imsc1.1/#image-ttml-image
[2] https://www.w3.org/TR/2018/REC-ttml2-20181108/#xml-lang-example-1
Please view or discuss this issue at https://github.com/w3c/imsc/issues/490 using your GitHub account
Received on Friday, 27 September 2019 09:27:44 UTC