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RDF stands for Resource Description Framework. Metadata is data about the data container itself; so a book about dogs may feature data about various dog species, etc., and metadata about the author, publisher, copyright, etc. RDF metadata provides a standardized way that a Web site can provide the world information about itself. Better ISP Web hosting (and ISP Web design) will provide RDF metadata files in addition to XHTML and CSS files. RDF metadata is one of the primary components of the semantic Web, and while it is not required a good ISP provider will use it (even the occasional free ISP uses it).