RE: TIME functions - reviews and requests

Dear Nicholas,

Apart from the spelling of ’stript’, the only question that I have is how much of the old OWL-Time (2006) should be supported. You could support everything, but that may encourage unwanted inappropriate legacy approaches. I suggest Simon is probably better placed to offer a useful opinion.

Similarly, I suppose you have a choice as to which various ‘convenience’ fucntions to support, but perhaps only experience will tell what will be good practice.

HTH, Chris

From: Nicholas Car <nicholas.car@surroundaustralia.com>
Sent: 10 September 2021 03:06
To: public-sdwig@w3.org
Subject: TIME functions - reviews and requests


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Dear SDWIG,

GeoSPARQL defines both ontology elements (classes and properties) and also SPARQL extension functions to calculate contains etc.

OWL Time defines ontology elements only.

I have prepared a SPARQL extensions functions library for OWL Time implemented in Python's rdflib:

  *   PyPI package: https://pypi.org/project/timefuncs/

  *   GitHub source code: https://github.com/RDFLib/timefuncs

I would be interested in any reviews and also in any requests/suggestions for functions yet to be implemented. There is no clear fixed set of time functions that could be implemented for we can surpass functions corresponding to pairwise object tests of Allen relations by including functions that might do things like determine what the Allen relationship is between two objects.

Once the function set is completed, I will re-implement the functions in Jena too.

Regards,

Nicholas



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