Site owners can use RDFa and eRDF markup to add metadata to their web pages. When Yahoo! crawls and indexes these pages, this metadata becomes available to SearchMonkey applications.
RDF markup has the following advantages:
eRDF and RDFa are emerging community standards.
Limited changes are required on the backend.
You can use eRDF/RDFa markup with the searchmonkey-profile vocabulary to declare metadata in your web pages. For more information, see Leveraging the Semantic Web and the Appendix B, SearchMonkey vocabularies vocabulary reference.