Whitehouse.gov incorporates RDFa mashup lingo
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President Obama's TIGR (Technology, Innovation and Government Reform) team has already extolled the merits of mashups, and now we're seeing the beginnings of mashup language RDFa take root on WhiteHouse.gov.
Viewing the site's copyright policy source reveals the use of RDFa tags such as xmlns,and property. These provide a set of XHTML attributes (metadata) to augment the visual data with information meant for other machines to read, recognize and catalog.