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Re: Table labeling

From: Al Gilman <asgilman@access.digex.net>
Date: Thu, 18 Jun 1998 09:00:46 -0400 (EDT)
Message-Id: <199806181300.JAA14921@access5.digex.net>
To: jkrieger@cast.org
Cc: w3c-wai-ig@w3.org
to follow up on what Josh Krieger said:

> I am trying to understand more about how to use the SCOPE
> and HEADERS attribute for labeling table cells. The
> examples at the end of the authoring guidelines are for
> very simple tables and I wonder about how these would
> really apply to many of today's tables that are used
> for layout. Is it even appropriate to use these attributes
> for layout based pages considering this is against the ethos
> of the working guidelines? I have to admit, I'm finding
> these attributes confusing. 

It is not appropriate to use SCOPE and HEADERS for layout tables.
These are to be used when one cell (de_facto header) gives
generic inforation about one or more other cells.  Pure layout
tables don't have these logical relationships between cells in
the grid.
> In particular, I don't understand how to do labeling
> when using: 1) nested tables, 2) column and/or row groups.
> And I don't have a clear idea when I would really want
> to use the HEADERS, the SCOPE, or the more general AXIS.
> In many ways, the AXIS attribute seems less about
> accessibility, and more about alternative views
> of the data.

For nested tables, I would have to see what it is used
for to comment.

For column or row groups you may use AXIS to construct a category
hierarchy.  That is, use AXIS if you have second-order metadata
visible in the table.

Yes, it is about alternate views.  It was supported by the WAI
reviewers, not invented by them.  Alternate views have proved
helpful in audio browsing of complex tables in some (not
exhaustive) experiments.

> I'm wondering if anyone has prepared a more comprehensive set
> of examples using these attributes, or if anyone has
> implemented a simple text-based table browser that is designed
> to help work with these issues.

All the HC work is still public.  If you don't find what you want
in terms of a life-size example in the final HTML 4 language, you
may find it helpful to review the discussion for some

This just gives you a rough orientation to the general ideas.
This is a good topic for the page authoring subgroup list.


Start at http://www.w3.org/WAI/HC/report.html

to work you way back into the TABLE materials.
Received on Thursday, 18 June 1998 09:00:29 UTC

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