Paper on the various kinds and uses of ontology in real-world applications (PDF).

Introductory paper by Natalya F. Noy and Deborah L. McGuinness, from Stanford University. Provides guidelines and examples using Protégé-2000.

An introduction both to developing ontologies and to using the Ontolingua Ontology Editor provided by the Stanford KSL Network Services.

Provides description and slides from a course given by Carsten Lutz and Ulrike Sattler at ESSLLI 2002, Trento, Italy.

A selection of papers by John Sowa, introducing main concepts, applications, a Knowledge Representation ontology, and tutorial on Maths and Logic foundations.

Provides pointers to material that help you go from ontology principles to practice using DAML+OIL and its successor OWL.

Published by SRI, a basic introduction using examples in biochemistry. [PPT format]

A brief introduction written for novice users and experts who wish to upgrade to OWL.

An introduction to OWL by Sean Bechhofer, Ian Horrocks and Peter F. Patel-Schneider, in the forms of a set of PDF documents and PPT presentations.

Short and long answers from Tom Gruber of Stanford University, Knowledge Systems Lab.