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				This Chapter is a presentation of Resource Description Framework (RDF)
				recommended by World Wide Web Consortium (W3C), to model meta-data about the
				resources of a web. 
				A D V E R T I S E M E N T
 It is  described in both the documents [1] and [2]; the former
				focuses mainly on syntactical aspects while latter addresses the definition of a
				vocabularies (often called schemas). Though this is the pragmatic approach, We will
				use slightly different plan, more suited to our own goals (using RDF in the knowledge
				representation systems). The first section will describe a RDF model, which is the
				fundamental	syntax. Second section will present the semantic aspects of RDF, the
				concepts and the corresponding vocabulary. The last section describes the XML syntax
				proposed in	[1].
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