Time Ontology in OWL
Jerry R. Hobbs and Feng Pan, W3C Working Draft
Members of W3C's Semantic Web Best Practices and Deployment Working Group have released the First Public Working Draft for "Time Ontology in OWL." The document presents an ontology of temporal concepts, OWL-Time (formerly DAML-Time), for describing the temporal content of Web pages and the temporal properties of Web services.
The ontology provides a vocabulary for expressing facts about topological relations
among instants and intervals, together with information about durations, and about datetime information. It also demonstrates in detail, using the Congo.com and Bravo Air examples from OWL-S, how this time ontology can be used to support OWL-S, including use cases for defining input parameters and (conditional) output parameters.
A use case for meeting scheduling is also shown. In the appendix we also describe a time zone resource in OWL we developed for not only the US but also the entire
world, including the time zone ontology, the US time zone instances,
and the world time zone instances.
See also the W3C news item: http://www.w3.org/News/2006#item172