The underlying idea of the Semantic Web is that web content should be expressed not only in natural language but also in a language that can be unambiguously understood, interpreted and used by software agents, thus permitting them to find, share and integrate information more easily. The central notion of the Semantic Web's syntax is the ontology, which is the taxonomy of classes of objects and of their inter-relationships.These taxonomies contain the idea of a particular domain of knowledge; the domain contains a set of vocabularies that consist of a set of words and phrases used to...