SWAD-Europe has announced the availability of SKOS-Core 1.0. Accoding to the guide, the Simple Knowledge Organization System is designed to support the definition of words and the association between words and phrases. One intended use for SKOS is in RDF thesauri.

SKOS-Core allows you to define concepts and concept schemes. A concept is any unit of thought that can be defined or described. A concept scheme is a collection of concepts.

A concept may have any number of attached labels. A label is any word, phrase or symbol that can be used to refer to the concept by people. A concept may have only one preferred label, and any number of alternative labels.

Relationships may be defined between concepts within the same concept scheme. Any such relationship is referred to here as a semantic relation.

Mappings may be defined between concepts from different concept schemes. Any such mapping is referred to here as a semantic mapping. Source