W3C First Public Working Draft: RDFa in XHTML: Syntax and Processing

W3C announced that the Semantic Web Deployment Working Group and the
XHTML2 Working Group jointly have published the First Public Working
Draft for "RDFa in XHTML: Syntax and Processing." RDFa attributes can
be used with languages such as HTML and XHTML to express structured data.
RDFa allows terms from multiple independently-developed vocabularies to
be freely intermixed. This document has parsing rules for those creating
an RDFa parser as well as guidelines for users in organizations who wish
to use RDFa. For those who would like start using RDFa, the RDFa Primer
is an introduction to its use and shows real-world examples. RDFa
alleviates the pressure on XML format authors to anticipate all the
structural requirements users of their format might have, by outlining
a new syntax for RDF that relies only on XML attributes. This
specification deals specifically with the use of RDFa in XHTML, and
defines an RDF mapping for a number of XHTML attributes, but RDFa can
be easily imported into other XML-based markup languages. RDFa shares
some use cases with microformats. Whereas microformats specify both a
syntax for embedding structured data into HTML documents and a vocabulary
of specific terms for each microformat, RDFa specifies only a syntax
and relies on independent specification of terms (RDF Classes and
Properties) by others. RDFa allows terms from multiple
independently-developed vocabularies to be freely intermixed and is
designed such that the language can be parsed without knowledge of
the specific term vocabulary being used. More Information See also the RDFa Primer 1.0: Click Here