Identifiers in the RDF Namespace
The RDF data model specifies the notion of triples and the idea of merging sets of triples as just shown. With the introduction of namespaces, RDF uses the infrastructure of the Web to represent agreements on how to refer to a particular entity. The RDF standard itself takes advantage of the namespace infrastructure to define a small number of standard identifiers in a namespace defined in the standard, a namespace called rdf.
rdf:type is a property that provides an elementary typing system in RDF. For example, we can express the relationship between several playwrights using type information, as shown in Table 3.9. The subject of rdf:type in these triples can be any identifier, and the object is understood to ...
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