The official page of the DAML+OIL specification, a precursor of the Ontology Web Language (OWL).

A proposal for a web-based representation and inference layer, using RDF Schemas.

OWL is a W3C Candidate Recommendation, designed to support ontologies distributed on the Web, using RDF.

IEEE Working Group standard specifying an upper ontology that should enable computers to utilize it for applications such as data interoperability, information search and retrieval, automated inferencing, and natural language processing.

An open-source project to create standards for combining RDF content and parseable Lojban text.

WebOnt Working Group is part of W3C Semantic Web Activity. Its objective is to develop a standard ontology language for the Semantic Web.