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  and ; 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 .