Some top-level ontologies

Here, we list some kind-of hierarchies of first order types. We do not address ontologies which are "theories" such as the ontologies of KSL (Stanford). (You migh also want to read this introduction to ontologies and this description of ontology-related concepts and tasks).

Concept type top-level ontologies

• The first two levels of the WordNet 1.5 ontology of noun meanings (the WordNet 1.5 ontology organizes 90.000 conceptual categories)
• The WordNet 1.5 top-level ontology integrated in a situation data model (-> this top-level ontology plus WordNet may be used for guiding knowledge representation (this is the ontology provided by default in our knowledge acquisition tool CGKAT))
• The Situation Data Model of Tepfenhart (1992)
• Sowa's top-level ontology for concept types (from a paper given at ICCS'95)
• The concept type hierarchy of the Generalized Upper Model

Relation type top-level ontologies

• The top-level relation type hierarchy proposed by CGKAT
• The relation type hierarchy of the Generalized Upper Model

Miscellaneous

• Ontology: A Resource Page
• IKARUS: a WWW accessible knowledge management system (some ontologies are provided)
• A WWW accessible prototype for WordNet 1.6, the multi-language WordNet (Netscape 2.0 required)