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Semantic Web for the Working Ontologist, 2nd Edition by James Hendler, Dean Allemang

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Schema Languages and their Functions

RDFS is the schema language for RDF. But what is a schema language in the first place? There are a number of successful schema languages for familiar technologies, but the role that each of these languages play in the management of information is closely tied to the particular language or system.

Let’s consider document modeling systems as an example. For such a system, a schema language allows one to express the set of allowed formats for a document. For a given schema, it is possible to determine (often automatically) whether a particular document conforms to that schema. This is the major capability provided by XML Schema definitions. XML parsers can automatically determine whether a particular XML document ...

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