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Re: About MinCardinality 0 on Observation

From: Krzysztof Janowicz <janowicz@ucsb.edu>
Date: Mon, 27 Mar 2017 21:21:56 -0700
To: Simon.Cox@csiro.au, maxime.lefrancois@emse.fr, public-sdw-wg@w3.org
Message-ID: <711a6eb6-d902-cc99-dfe6-3cf088afc5f0@ucsb.edu>
On 03/27/2017 01:26 AM, Simon.Cox@csiro.au wrote:
>
> ØSome of the local restrictions on sosa:Observation are:
>
> Where are these axioms? Not in sosa.ttl. I guess you are referring to 
> the changes you propose/discuss in the other mails?
>

We do not have such axioms in SOSA (and we should not).


> Ø1. when we will talk about sosa:resultTime, we should not forget to 
> also talk about this property ssn:observationResultTime.
>
> If ssn:observationResultTime is a sub-property of sosa:resultTime then 
> anything that is said about sosa:resultTime. Then there will be the 
> additional axioms related to sosa:resultTime only (if there are none, 
> then we don’t need sosa:resultTime).
>
> Ø2. what is the proposal for ssn:observationSamplingTime in ACTION-286?
>
> Is ssn:observationSamplingTime sub-property of sosa:phenomenonTime ?
>
> Or is it related to sampling in the snese used in SOSA?
>
> The old SSNX usage of ‘sampling’ was inconsistent with sosa Sampling.
>
> Simon
>
> *From:*Maxime Lefrançois [mailto:maxime.lefrancois@emse.fr]
> *Sent:* Monday, 27 March, 2017 18:25
> *To:* SDW WG Public List <public-sdw-wg@w3.org>
> *Subject:* About MinCardinality 0 on Observation
>
> Dear all,
>
> Some of the local restrictions on sosa:Observation are:
>
> ObjectMinCardinality( 0 ssn:observationResultTime )
>
> ObjectMinCardinality( 0 ssn:observationSamplingTime )
>
> ObjectMinCardinality( 0 ssn:qualityOfObservation )
>
> If I understood correctly, those min cardinality 0 are meant to 
> document the fact that these properties "should" be attached to 
> instances of sosa:Observation. I will not debate on this and why we do 
> not define domains for these properties whose URIs even contain the 
> string "observation".
>
> Just:
>
> 1. when we will talk about sosa:resultTime, we should not forget to 
> also talk about this property ssn:observationResultTime.
>
> 2. what is the proposal for ssn:observationSamplingTime in ACTION-286?
>
> 3. there is ssn:qualityOfObservation. How is it used? Could we also 
> define a ssn:simpleQualityOfObservation  that is a datatype property?
>
> Best,
>
> Maxime
>


-- 
Krzysztof Janowicz

Geography Department, University of California, Santa Barbara
4830 Ellison Hall, Santa Barbara, CA 93106-4060

Email: jano@geog.ucsb.edu
Webpage: http://geog.ucsb.edu/~jano/
Semantic Web Journal: http://www.semantic-web-journal.net
Received on Tuesday, 28 March 2017 04:22:31 UTC

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