Semantic Overload

So, does EPUB 3.0.1 adding both RDFa and Microdata attributes officially qualify it for semantic overload? Are there just too many ways to express semantics: epub:type, ARIA role, RDFa, microdata and even microformats can all be used.

The answer is probably yes and no, with any fault you might be inclined to find lying at the feet of the W3C where these things are ground out. One of HTML’s drawbacks has been the lack of a standardized way of expressing meaningful information about the structure and content of documents. It’s led to the current proliferation of mechanisms, each of which serves a useful function, but the sum of which invariably makes for confusion.
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Taking a stroll back into Z39.98 territory has me thinking about the Digital Image And Graphic Resources for Accessible Materials (DIAGRAM) content model, and, more specifically, whether it could be reformulated now that longdesc appears to have a new lease on life.

Which isn’t to suggest that there’s necessarily anything wrong with the content model we have, or that it’s no longer useful, but working on the A11Y Metadata Project to get accessibility metadata into, and seeing LRMI already ahead of the game, it seems natural enough that the content model be expressible as native (X)HTML5 for cases when that is necessary. Accommodating more than one way to render information is never a bad thing, after all.Continue Reading DIAGRAM Musings