RDFa in Drupal core: some suggestions from the semantic web community
Key words and phrases
taxonomy module drupal add semantic web URI URL fieldTags
Description
http://drupal.org/project/vcard
Suggested simplification of the syntax, and a small correction, from working for Taxonomy module is that a the URI for a publicly defined, shared ontology can be added to a Drupal term as metadata, which the proposed taxonomy_term_load hook would enable.
Currently in SCF the external ontology is linked to in the synonyms of the terms, with a URL as one of the synonyms! For instance:
http://scf-demo.iic.harvard.edu/admin/content/taxonomy/edit/term/4393
http://www.berkeleybop.org/ontologies/owl/GO#GO_0006207
One person also referenced SCOT [but P has tried it out and could not use it for, at least, specific scientific purposes].

Overview of RDFa in Drupal 7 core efforts:
http://robshouse.net/blog-post/drupal-formative-stages-adding-rdfa-seman...
And doing it in Drupal 6 right now:
http://realtech.burningbird.net/semantic-web/semantic-markup/rdfaificati...