From MathWeb

wikipedia says: An ontology is a data model that represents a domain and is used to reason about the objects in that domain and the relations between them. Ontologies generally describe:

Individuals

the basic or "ground level" objects.

Classes

sets, collections, or types of objects.

Attributes

properties, features, characteristics, or parameters that objects can have and share.

Relations

ways that objects can be related to one another.

Contents 1 Other definitions 2 Ontology types 3 Ontology Languages 4 Ontology Editors 5 Ontology Design Methods

Other definitions

1. Philosophy: a scaffold of concepts we can talk and agree about
2. Semantic Web people: formulae in Description logic (decidable!)

... where (2) is a subset of (1).

Source: talk with Michael Kohlhase, 20:46, 16 January 2007 (CET)

Ontology types

• Document ontology
• Domain ontology
• System ontology
• Upper ontology

How do both ontology types relate?

• Document ontologies specify the vocabular which is used to model domain ontologies. (???)

Ontology Languages

Attempto Controlled English, CASL, F-Logic, N3, OMDoc, OWL, OWL-DL, RDF, RDF/XML, RDFa, RXR, Resource Description Framework, TriX, and UML

Ontology Editors

ArgoUML, IsaViz, Protégé, Rice, and SWOOP

Ontology Design Methods

In the first step convert a XML schema via a XSLT into a argoUML XML file and then convert this argoUML XML file -- again via a XSLT -- into OWL-DL file. So the final OWL-DL file would serve as a basis to setup a system ontology.--Nmueller 12:45, 23 November 2006 (CET)