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The Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies.Ontologies are a formal way to describe taxonomies and classification networks, essentially defining the structure of knowledge for various domains: the nouns representing classes of objects and the verbs representing relations between the objects.
A typical example of an rdfs:Class is foaf:Person in the Friend of a Friend vocabulary. [8] An instance of foaf:Person is a resource that is linked to the class foaf:Person using the rdf:type property, such as in the following formal expression of the natural-language sentence: 'John is a Person'. ex:John rdf:type foaf:Person
Description logic provides an extension of frame languages, without going so far as to take the leap to first-order logic and support for arbitrary predicates. KL-ONE; RACER; OWL. Gellish is an example of a combined ontology language and ontology that is description logic based. It distinguishes between the semantic differences among others of:
To enable the encoding of semantics with the data, technologies such as Resource Description Framework (RDF) [2] and Web Ontology Language (OWL) [3] are used. These technologies are used to formally represent metadata. For example, ontology can describe concepts, relationships between entities, and categories of things.
They use an ontology driven data architecture to semantically annotate their published reviews with RDF based structured data. [53] RDF Site Summary – one of several "RSS" languages for publishing information about updates made to a web page; it is often used for disseminating news article summaries and sharing weblog content.
Simplistic example of the sort of semantic net used in Semantic Web technology. The ultimate goal of semantic technology is to help machines understand data. To enable the encoding of semantics with the data, well-known technologies are RDF (Resource Description Framework) [1] and OWL (Web Ontology Language). [2]
Examples: Niger is-a country. Chad is-a country; Niger is-next-to Chad. Agadez is-a city. Agadez is-located-in Niger. TBox statements typically (or definitions of domain categories and implied relations) such as: An entity X can be a country or a city So Dagamanet is-a neighbourhood is not a fact you can specify, though it is a fact in real life.
It is common for ontology editors to use one or more ontology languages. Aspects of ontology editors include: visual navigation possibilities within the knowledge model, inference engines and information extraction; support for modules; the import and export of foreign knowledge representation languages for ontology matching; and the support of ...