Wikidata:WikiProject Ontology/Ontology

Types of OntologiesEdit

  • upper ontology: An upper ontology is an ontology which connect several domain ontologies.
  • domain ontology: A domain ontology represents concepts which belong to specific field where terms are clearly identified.

Characteristics of OntologiesEdit

Parts of OntologiesEdit

An ontology is composed of:

  • individuals known as instances
  • properties which link individuals amongst themselves
  • classes defined as sets containing individuals


  • A class hierarchy is called a taxonomy.