  This document specifies a standard format for vocabularies based on the W3C's
Resource Description Framework (RDF) and Simple Knowledge Organization System
(SKOS). By adopting a standard and simple format, the IVOA will permit
different groups to create and maintain their own specialised vocabularies
while letting the rest of the astronomical community access, use, and combine
them. The use of current, open standards ensures that VO applications will be
able to tap into resources of the growing semantic web. The document provides
several examples of useful astronomical vocabularies.
