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Subject: Re: DOCBOOK-APPS: Re: XSL implementation of DBTeXMath
Jirka Kosek <jirka@kosek.cz> writes: > Norman Walsh wrote: > > > With respect, I think that's abuse of the alt tag. Might I suggest instead > > supporting this with: > > I don't want abuse alt. But from my reading of alt element description > in TDG: > > ---- > Description > A text (or other nonvisual) description of a graphical element. This is > intended to be an alternative to the graphical presentation. > > Parents > These elements contain alt: equation, informalequation, inlineequation. > ---- The TDG reference page for Inlineequation: http://www.oreilly.com/catalog/docbook/chapter/book/inlineequation.html actually has the same contents for <alt> that you've described: <inlineequation> <alt>e=mc^2</alt> <graphic fileref="figures/emc2"></graphic> </inlineequation> But I guess that's a case of a very simple equation for which the Tex math happens to match the meant-to-be-human-readable text description. Looking at the TDG examples for the other equation elements: <equation><title>Fermat's Last Theorum</title> <alt>x^n + y^n ≠ z^n ∀ n ≠ 2</alt> <graphic fileref="figures/fermat"></graphic> </equation> <informalequation> <alt>e^(pi*i) + 1 = 0</alt> <graphic fileref="figures/epi10"></graphic> </informalequation> ...I guess maybe you can infer that the DocBook TC intended the contents of <alt> to be a *human-readable* text description, using ISO entities for any math symbols that couldn't be represented with normal characters. But maybe if you use <alt role="tex">, you could tweak the stylesheets so that to the HTML output they add some generated text like: <img alt="Tex version of equation: [Tex stuff]"> That way, to people reading or hearing the alt text in a browser, it'll at least be unambiguous to them that what's they're reading/ hearing is Tex math -- which, depending on the complexity of the equation, they may or may not find "human-readable". Just my two yen, --Mike
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