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Resource Description Framework (RDF) is the standard for encoding metadata and other structured information on the Semantic Web.
RDF presents small chunks of information in a form that infers meaning. This can include rules about how the data should be interpreted so the overall informational value is much greater because context or intent can be inferred.
RDF was developed by the World Wide Web Consortium (W3C) with Xtensible Markup Language (XML) and Uniform Resource Identifier (URI) serving as its distribution standards.
RDF is primarily used to provide information or metadata for data available on the Internet. RDF provides the methodology for specifying, structuring and transferring metadata, and provides the basic XML syntax for software applications to exchange or use that information; URI/URL provide the location of that data.
Typically, RDF provides basic information and attributes about an Internet-based object, such as the name of the author, Web page keywords, object creation/editing data, sitemap, etc.