a relevant reading: ARIA attributes

Henry Thompson wrote a blog entry in the W3C QA blog:

http://www.w3.org/QA/2008/05/syntax_for_aria_costbenefit_an.html

it is not on RDFa but the usage and definition of Aria attributes[1], 
but some issues (primarily the HTML5 related alternatives) may become 
relevant for RDFa, too.

Ivan

[1] http://www.w3.org/TR/wai-aria/
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Ivan Herman, W3C Semantic Web Activity Lead
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