a framework for metadata and provides for interoperability for applications in "machine-understandable" information on the Web. RDF draws upon several technologies such as XML (Extensible Markup Language). RDF a recommendation of the World Wide Web Consortium currently headed by Tim Bermers-Lee, the creater of the HTML markup language and the http protocol that is the basis of the World Wide Web. Over the long run, Berners-Lee envisions a time when Web sites can be devoid of most broken links and difficult-to-find information. The first step to understanding RDF is to distinguish between data and metadata. Metadata tags in documents and databases provide "data about data" like unseen genes provide data about body parts. One of the drawbacks of HTML is that HTML tags relate only symbols rather than attributes of what the symbols depict. For example, HTML tags tell us how to display the word "eyes" in a web document but there are no tags related to attributes such as eye color, eye size, vision quality, and susceptibility to various eye diseases.
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