OWL-Time - ISSUE-161: Possible ambiguity

This issue relates to the description of time positions using a particular calendar/clock system which also allows for seasonal changes in certain time-zones.

We agree that more information would be required to enable the determination of the order of seconds denoted using the calendar-clock system when the clocks change.
The question appears to conflate two issues:

(i)                 The identifier for the time zone

(ii)               Whether the zone identified is geographic, or an offset from UTC.

On item (i) we note that the revised ontology clarifies that the time:timeZone property is an owl:ObjectProperty, with the rdfs:range time:TimeZone. Although OWL-Time no longer provides a time-zone ontology per se, it is now clear that the object of a time:timeZone property must be a resource, not just a name or label, and implicitly the resource will be denoted by a URI. The examples in the revised spec link to well curated descriptions of timezones maintained by reliable organizations.

On item (ii) we believe there is no ambiguity here - time-zone indicates offset from UTC, not geography.

We hope this resolves the issue satisfactorily.

Simon J D Cox
Research Scientist
Environmental Informatics
CSIRO Land and Water<http://www.csiro.au/Research/LWF>

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