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| | Time Zone Resource in OWL |
 | | For each time standard, there is a zone, or geographical region, and a time of the year in which it is used for describing local times. |
 | | Where and when a time standard is used have to be axiomatized, and this involves interrelating a time ontology and a geographical ontology. |
 | | We have developed a time zone resource [5] in OWL for not only the US but also the entire world, including three parts: the time zone ontology file [6], the US time zone instance file [7], and the world time zone instance file [8]. |
| www.w3.org /2001/sw/BestPractices/OEP/Time-Zone (2297 words) |
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