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I have an additional suggestion that I believe would help the acceptance of this document within the general working group. Add an informative section detailing several of the many cases where it is inappropriate to use @longdesc. For example… 1. @longdesc is inappropriate when an EPUB footnote is sufficient. 2. @longdesc is inappropriate for Math. Use MathML instead. 3. @longdesc is inappropriate for SVG graphics. Make the SVG DOM accessible instead. 4. @longdesc is inappropriate for graphics of tabular data. Use an accessible table instead. More examples at http://cookiecrook.com/longdesc/ These should probably be added to the WCAG 2.0 Techniques documents as well.