The RDF Schema Language

RDFS “extends” RDF by introducing a set of distinguished resources into the language. This is similar to the way in which a traditional programming language can be extended by defining new language-defined keywords. But there is an important difference: In RDF, we already had the capability to use any resource in any triple (Anyone can say Anything about Any topic). So by identifying certain specific resources as “new keywords,” we haven’t actually extended the language at all! We have simply identified certain triples as having a special meaning, as defined by a standard.

How can we define the “meaning” of a distinguished resource? As we saw in Chapter 6, in RDFS, meaning is expressed by specifying inferences that can ...

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