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

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.

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

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

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

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

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

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

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.