This is a substantial update to and replacement for the previous SKOS Core Vocabulary Specification W3C Working Draft dated 2 November 2005. The publication has been announced in the W3C news, and a request for comments has been sent to various mailing lists.
The abstract from this new specification:
This document defines the Simple Knowledge Organization System (SKOS), a common data model for sharing and linking knowledge organization systems via the Semantic Web.
Many knowledge organization systems, such as thesauri, taxonomies, classification schemes and subject heading systems, share a similar structure, and are used in similar applications. SKOS captures much of this similarity and makes it explicit, to enable data and technology sharing across diverse applications.
The SKOS data model provides a standard, low-cost migration path for porting existing knowledge organization systems to the Semantic Web. SKOS also provides a light weight, intuitive language for developing and sharing new knowledge organization systems. It may be used on its own, or in combination with formal knowledge representation languages such as the Web Ontology language (OWL).
This document is the normative specification of the Simple Knowledge Organization System. It is intended for readers who are involved in the design and implementation of information systems, and who already have a good understanding of Semantic Web technology, especially RDF and OWL.
For an informative guide to using SKOS, see the upcoming SKOS Primer.
Using SKOS, conceptual resources can be identified using URIs, labeled with lexical strings in one or more natural languages, documented with various types of note, linked to each other and organized into informal hierarchies and association networks, aggregated into concept schemes, and mapped to conceptual resources in other schemes. In addition, labels can be related to each other, and conceptual resources can be grouped into labeled and/or ordered collections.