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OWL-Time and enhancements

Enhancing W3C OWL-Time to allow temporal position in non-Gregorian reference system

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OWL-Time and enhancements

  1. 1. Simon Cox 16 September 2015 LAND AND WATER OWL-Time and enhancements Briefing for Spatial Data on the Web Working Group
  2. 2. OWL-Time and enhancements | Cox2 |
  3. 3. Allen’s temporal model OWL-Time and enhancements | Cox3 |
  4. 4. OWL-Time and enhancements | Cox4 | “2015-03-10T17:10:00.00+01:00”^^xsd:DateTime gYear, gMonth, gDay tied to Gregorian Calendar No way to use (or even indicate) other temporal reference systems e.g. geologic time, GPS/Unix time, Hebrew calendar, archeological periods, dynastic systems …
  5. 5. Generalization to enable other time systems OWL-Time and enhancements | Cox5 | No change to existing rdf instances!
  6. 6. Summary • OWL-Time is based on rigorous temporal calculus, supporting ordering of events • All of Allen’s temporal relations are supported for ‘ProperIntervals’ • Time position in OWL-Time is limited to Gregorian calendar would drive technical and cultural users elsewhere  • Proposed generalization supports • Indication of a temporal reference system (externally described) • more representations: Coordinate (number on timeline), ordinal values (named intervals) • Interval logic is retained, no change for existing OWL-Time users OWL-Time and enhancements | Cox6 |