RE: OWL-Time - superclasses for Position and Duration

Unless anyone objects, I propose to accept the pull-request https://github.com/w3c/sdw/pull/515 which adds two superclasses to OWL-Time.

The effect of these is to properly recognize that

-          :GeneralDurationDescription and :Duration are both the same kind of thing, here called :TemporalDuration

-          :GeneralDateTimeDescription and :TimePosition are both the same kind of thing, here called :TemporalPosition

Without these superclasses there is not a proper connection from the classes :DurationDescription and :DateTimeDescription from OWL-Time 2006, and :Duration and :TimePosition introduced in this revision.

This is in the tracker as ISSUE-149

Simon


From: Simon.Cox@csiro.au [mailto:Simon.Cox@csiro.au]
Sent: Friday, 27 January, 2017 11:21
To: public-sdw-wg@w3.org
Subject: [ExternalEmail] OWL-Time - superclasses for Position and Duration

I've done a little more work on the OWL-Time spec to introduce superclasses for temporal duration and temporal position. These provide a common superclass above Duration/GeneralDurationDesciption and TimePosition/GeneralDateTimeDescription, respectively.

I've pushed these into a new branch https://github.com/w3c/sdw/tree/simon-time-superclasses
Probably the easiest way to grok is to look at the diagrams

https://github.com/w3c/sdw/blob/simon-time-superclasses/time/images/TemporalDuration.png
https://github.com/w3c/sdw/blob/simon-time-superclasses/time/images/TemporalPosition.png

and compare with the disjointed figures in the current draft

http://w3c.github.io/sdw/time/

Note that the subclassing of these classes is based on implementation options, rather than actual topology which is the case for

https://github.com/w3c/sdw/blob/simon-time-superclasses/time/images/TemporalEntity.png

While this does not affect the existing functionality, it provides a better upper level to the OWL-Time ontology and thus makes the whole thing a bit clearer. (i.e. I know this just looks like more tinkering, but I think it helps the overall picture).

Simon

Simon J D Cox
Research Scientist
Environmental Informatics
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