[First post to this list. I'm a novice here so treat me gently :-) ]
There is also the GRDDL (Gleaning Resource Descriptions from Dialects of
Languages) mechanism described at http://www.w3.org/2004/01/rdxh/spec.
It is a mechanism for "getting RDF data out of XML and XHTML documents
using explicitly associated transformation algorithms, typically
represented in XSLT".
Although the example in that document illustrates extraction of DC
metadata from <meta> html elements, there would be no reason why the
mechanism should not extract the metadata from arbitrary elements
identified by id; it is just a different XSLT transformation.
If one were to use the class attribute rather than id, and standardise
the values of class, we'd be on the way to defining a DC microformat
(see http://www.microformats.org/).
Alan Cox
Natural Environment Research Council
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