OWL-Time and enhancements
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Enhancing W3C OWL-Time to allow temporal position in non-Gregorian reference system
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OWL-Time and enhancements
- 1. Simon Cox 16 September 2015 LAND AND WATER OWL-Time and enhancements Briefing for Spatial Data on the Web Working Group
- 2. OWL-Time and enhancements | Cox2 |
- 3. Allen’s temporal model OWL-Time and enhancements | Cox3 |
- 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. Generalization to enable other time systems OWL-Time and enhancements | Cox5 | No change to existing rdf instances!
- 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 |
Notas del editor
- OWL Time was designed to support time-stamps related to contemporary events described in web pages. Allen’s interval calculus was designed to support sorting of events in record-keeping systems.
- Based on Allen’s ‘interval calculus’: primitive is interval, has duration, beginning, end (even an Instant has beginning and end!) Two alternative representations of temporal position: inXSDDateTime – uses familiar 7-component micro-format 2015-03-10T17:10:00.00+01:00 inDateTime – decomposes components in separate elements: year, month, day, hour, minute, second, timeZone
- Proposed generalization has these features: GenDateTimeDescription generalizes DateTimeDescription Year, month day are not limited to Gregorian Calendar hasTRS property TimePosition supports other representations of time position Temporal coordinates (GPS time, Unix time, Loran-C) Ordinal values (named intervals – archeology, geology, dynasties) (assuming enhancement is deployed in the same namespace) NO CHANGE to existing usage of OWL-Time