The SKOS-Core 1.0 schema can be found at
http://www.w3.org/2004/02/skos/core
The SKOS-Core 1.0 Guide accompanying the schema can be found at
http://www.w3.org/2001/sw/Europe/reports/thes/1.0/guide/
Also, the website for the SWAD-Europe Thesaurus Activity has moved to
http://www.w3.org/2001/sw/Europe/reports/thes/
SKOS stands for Simple Knowledge Organisation System. The Goal of SKOS-Core is to provide a framework for bringing existing knowledge organisation systems such as thesauri and the semantic web together.
SKOS-Core exploits the features of RDFS and OWL to provide a flexible and extensible framework within which different types of KOS can interoperate. SKOS-Core is ideal for modelling thesauri, and can cope with the variations commonly found in thesaurus design and structure.