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“4137X˙CH03˙Akerkar” — 2007/9/8 — 10:42 — page 83 — #13
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3.4 Ontology Languages for the Web 83
• RDF Schema is a vocabulary description language for describing properties and classes
of RDF resources, with semantics for generalization hierarchies of such properties and
classes.
• OWL is a richer vocabulary description language for describing properties and classes,
such as relations between classes, cardinality, equality, richer typing of properties, char-
acteristics of properties, and enumerated classes.
Ontologies are principally classified as general and domain-specific. They can be built using
XML and RDF; however, nowadays there are specific ...