Misc,
RDFa in XHTML: Syntax and Processing -- A Collection of Attributes and Processing Rules for Extending XHTML to Support RDF
W3C Recommendation, (Oct 14, 2008)http://www.w3.org/TR/rdfa-syntax/.
Abstract
RDFa is a specification for attributes to express structured data
in any markup language. This document specifies how to use RDFa with
XHTML. The rendered, hypertext data of XHTML is reused by the RDFa
markup, so that publishers don't need to repeat significant data
in the document content. The underlying abstract representation is
RDF, which lets publishers build their own vocabulary, extend others,
and evolve their vocabulary with maximal interoperability over time.
The expressed structure is closely tied to the data, so that rendered
data can be copied and pasted along with its relevant structure.
The rules for interpreting the data are generic, so that there is
no need for different rules for different formats; this allows authors
and publishers of data to define their own formats without having
to update software, register formats via a central authority, or
worry that two formats may interfere with each other. 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 (often
called vocabularies or taxonomies) 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.
