OWL allows us to provide more machine readability than extensible markup language
(XML), RDF, and RDF schema. In the Semantic Web, OWL is used when
information must be processed from application (and not only presented to human).
OWL allows us to provide a detailed description of any domain.
OWL added new vocabulary (compared to RDF and DAML+OIL) to describe classes
and relationships; it supports a useful mechanism to integrate different ontologies.
OWL is made up of three different languages each of them is the extension of its
ancestor:
??? OWL lite allows us to give simply a taxonomy without complex constraint.
??? OWL description logic (OWL DL) gives high complexity, completeness, and
decidability.
??? OWL full.gives expressiveness but does not give decidability.
The OWL main primitives are:
???. Classes. Classes allow the abstraction of some concepts. Each class has a set
of properties (each one for specific concept characteristics). A class would be
composed by subclasses.
???. Properties. There are two types of properties: DataType specific to each class
and ObjectProperty used to create a link between classes.
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