Recently Digg made an official adoption of RDFa (a set of extensions to XHTML being proposed by the W3C). While watching a tutorial about RDFa (below video) I asked myself how it could be possible to do it for Flash/ Flex document.
In fact bringing RDFa to a SWF itself is not possible, as I far as I know, but if you use XSLT and XML to provide the data to your SWF then you can also add the RDFa extension into your content, very easily!
Some more explanation on how to embeded RDF attribute on a XHTML web page:
Ahmet