owl-time and enhancements
TRANSCRIPT
Simon Cox16 September 2015
LAND AND WATER
OWL-Time and enhancementsBriefing for Spatial Data on the Web Working Group
OWL-Time and enhancements | Cox2 |
OWL-Time and enhancements | Cox
Allen’s temporal model
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OWL-Time and enhancements | Cox4 |
“2015-03-10T17:10:00.00+01:00”^^xsd:DateTime gYear, gMonth, gDay tied to Gregorian CalendarNo way to use (or even indicate) other temporal reference systems e.g. geologic time, GPS/Unix time, Hebrew calendar, archeological periods, dynastic systems …
OWL-Time and enhancements | Cox
Generalization to enable other time systems
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No change to existing rdf instances!
OWL-Time and enhancements | Cox
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 calendarwould 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
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