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In computer science and artificial intelligence, ontology languages are formal languages used to construct ontologies. They allow the encoding of knowledge about specific domains and often include reasoning rules that support the processing of that knowledge. Ontology languages are usually declarative languages, are almost always generalizations of frame languages, and are commonly based on either first-order logic or on description logic.

Contents 1 Classification 1.1 Traditional ontology languages 1.2 By syntax 1.2.1 Markup ontology languages 1.3 By structure 1.3.1 Frame-based 1.3.2 Description logic-based 1.3.3 First-order logic-based 2 See also 3 References

[edit] Classification

[edit] Traditional ontology languages

• CycL
• DOGMA (Developing Ontology-Grounded Methods and Applications)
• F-Logic (Frame Logic)
• KIF (Knowledge Interchange Format)
  • Ontolingua based on KIF
• KL-ONE
• KM programming language
• LOOM (ontology)
• OCML (Operational Conceptual Modelling Language)
• OKBC (Open Knowledge Base Connectivity)
• PLIB (Parts LIBrary)
• RACER

[edit] By syntax

[edit] Markup ontology languages

These languages use a markup scheme to encode knowledge, most commonly XML.

• DAML+OIL
• Ontology Inference Layer (OIL)
• Web Ontology Language (OWL)
• Resource Description Framework (RDF)
• RDF Schema
• SHOE

[edit] By structure

[edit] Frame-based

FLogic, OKBC, and KM, are completely or partially frame-based languages.

[edit] Description logic-based

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. Examples include KL-ONE, RACER and 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:

• relation types for relations between concepts (classes)
• relation types for relations between individuals
• relation types for relations between individuals and classes

It also contains constructs to express queries and communicative intent.

[edit] First-order logic-based

CycL and KIF are examples of languages that support expressions in first-order logic, and, in particular, allow general predicates.

[edit] See also

• Formal concept analysis
• Lattice (order)
• Domain theory
• Galois connection

[edit] References

• Oscar Corcho, Asuncion Gomez-Perez, A Roadmap to Ontology Specification Languages (2000)
• Introduction to Description Logics DL course by Enrico Franconi, Faculty of Computer Science, Free University of Bolzano, Italy

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