The existing
works are mainly about comparing different ontology languages, then choosing the
best ontology language to use. Different from the existing works, this chapter is
mainly about how to organize ontology languages and ontologies with hierarchies,
therefore we mainly compare the changes of primitives in different ontology languages.
From these changes, we can find the change trends of ontology languages,
then it is motivated, that is, it is very important to effectively organize different
ontology languages.
The Simple HTML Ontological Extensions (SHOE) (Luke & Heflin, 2000) extends
HTML with machine-readable knowledge annotated, thus the implicit semantic information
can be discovered by a computer. Although SHOE has the XML version,
it is not based on the Resource Description Framework (RDF) (Lassila & Swick,
2004) and RDF Schema (RDFS) (Brickley & Guha, 2004).
RDF (Lassila & Swick, 2004) is a standard language of W3C for defining ontologies.
RDF defines a simple model for describing relationships among resources
in terms of properties and values. A resource represents anything specified by a
uniform resource identifier (URI) (Lee, Fielding, & Masinter, 1998).
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