Re: Forecasts and observations - was I RE: SSN Thread for github issue 378 - Side effects of ssn:Observation being a kind of dul:Event instead of dul:Situation

+1 for what you suggest Kerry.
And I suggest we document this conceptual change in a skos:changeNote
attached to oldssn:Observation.
Kind regards,
Maxime


Le mar. 21 févr. 2017 à 12:33, Kerry Taylor <kerry.taylor@anu.edu.au> a
écrit :

> SSN-people,
>
> I am trying to close off this subject as originally posed – and without
> diverting into  the bigger issue of forecasts and observations. It relates
> to solving issue-62 and issue-67 (how does ssn:observation get re-worked as
> an activity/act?)
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> (1) Please see the conversation thread here.
> https://lists.w3.org/Archives/Public/public-sdw-wg/2016Oct/0089.html
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> (2) it was rooted in Maxime’s observation that
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>         ssn:Observation rdfs:subClassOf [ owl:onProperty dul:includesEvent
> ; owl:someValuesFrom ssn:Stimulus ] .
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> and Maxime’s suggestion (among others that were discussed extensively) that
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> Ø  should this axiom be simply deleted from the SSN-DUL alignment ?
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> (3) I propose that we do exactly as posed here --- that is, delete the
> axiom ssn:Observation rdfs:subClassOf [ owl:onProperty dul:includesEvent
> ; owl:someValuesFrom ssn:Stimulus ]
>
> from
> https://github.com/w3c/sdw/blob/gh-pages/ssn/ssn_separated/dul-alignment.owl
>
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> (4) figure 5.9 here may help understanding
> https://www.w3.org/2005/Incubator/ssn/XGR-ssn-20110628/
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> (5) I don’t think  deleting the axiom creates a big problem as the
> Stimulus can still be reached from the Observation via the Sensor that
> observed it and Stimulus it detects. And if there is an issue with sensors
> detecting multiple stimuli (which ssn allows) and so we would not know
> which stimulus was involved in the observation (which can happen), then
> someone using ssn is going to have to work harder and define a fresh sensor
> for each distinct stimulus if they need this.
>
>
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> (6) What to do with the alignment to old ssn? The change to the dul
> alignment of Observation itself is already problematic :
>
> ssn:Observation<http://www.w3.org/ns/ssn/Observation> becomes a kind of dul:Event<http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#Event> instead of a dul:Situation
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> So… I don’t think we can align old and new ssn in an ontology fragment for
> this. I propose that the best we can do is explain the change in
> documentation. Any better idea?
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> Does anyone object to this path forward?
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> -Kerry
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