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.
