Update/Note: This is not an official RDFa button, those (in the known colours) will be provided by W3C's Communications Team once RDFa is a Rec or CRec.
A couple of days ago I created an RDFa technology button, and I was asked to share it, so here it is:

(
PNG,
GIF,
SVG source file)
Please see the
W3C Semantic Web Logos and Policies page for license details. This button is derived from the original W3C ones.
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