Current Web pages, written in XHTML, contain inherent structured data: calendar events, contact information, photo captions, song titles, copyright licensing information, etc. When authors and publishers can express this data precisely, and when tools can read it robustly, a new world of user functionality becomes available, letting users transfer structured data between applications and Web sites. An event on a Web page can be directly imported into a desktop calendar. A license on a document can be detected to inform the user of his rights automatically. A photo's creator, camera setting information, resolution, and topic can be published as easily as the original photo itself. This document is an introduction to RDFa, a method for achieving precisely this kind of structured data embedding in XHTML.

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W3C Recommendations

W3C, institution. (2007). RDFa Primer, Embedding Structured Data in Web Pages. (M Birbeck & not CWI et al, Eds.)W3C Recommendations. W3C.