This guide contains links to many RDF resources including examples, documents, software, tools and projects that use RDF, a standard for describing resources on the web.
This service lets you validate XML documents such as XHTML against the appropriate schemas. It performs a more accurate validation than the W3C validator.
This schema is currently referred to as "NISO Metadata for Images in XML (NISO MIX)". MIX is expressed using the XML schema language of the World Wide Web Consortium. MIX is maintained for NISO by the Network Development and MARC Standards Office of the Library of Congress with input from users.
G. Bex, F. Neven, and J. Van den Bussche. WebDB '04: Proceedings of the 7th International Workshop on the Web and Databases, page 79--84. New York, NY, USA, ACM Press, (2004)