Re: OnAgainOffAgain relations - beyond celeb marriage: Org membership

On 10/12/2021 04:05, Anthony Moretti wrote:
> Agreeing with Dan here, you could argue that any instance of 
> schema:Event is also an example.
+1
>
> Taking Simon's example:
> Bob - is captain of - Bowls Club - Jan 1, 2019–Dec 31, 2019
> Bob - is captain of - Bowls Club - Jan 1, 2020–Dec 31, 2020
>
> Seems equivalent to:
>
> schema:Event
> Bob's captaincy of Bowls Club 2019
> startTime: Jan 1, 2019
> endTime: Dec 31, 2019
>
> schema:Event
> Bob's captaincyof Bowls Club 2020
> startTime: Jan 1, 2020
> endTime: Dec 31, 2020

Idea:

define a schema:realizationOf property, whose domain is schema:Event and 
range is rdf-star:Triple (with an inverse property schema:realization). 
The above could be expressed in JSON-LD-star [1] as follows:

{
     "@context": "https://schema.org/",
     "@type": "Event",
     "realizationOf": { "@id": {
         "@id": "#bowls_club",
         "captain": "#bob"
     }},
     "startDate": "01-01-2019",
     "endDate": "31-12-2019"
}

(assuming that "realization" and "captain" are part of the schema.org 
context)

The annotation syntax could also be used, if bob was *currently* captain 
of the club:

{
     "@context": "https://schema.org/",
     "@id": "#bowls_club",
     "captain": {
         "@id": "#bob",
         "@annotation": {
             "realization": {
                 "@type": "Event",
                 "startDate": "01-01-2021",
                 "endDate": "31-12-2021"
             }
         }
     }
}

   pa

[1] https://json-ld.github.io/json-ld-star/



PS: in case anyone is wondering, the Turtle-star corresponding to the 
above JSON-LD-star would be

[] a s:Event ;
     s:realizationOf << <#bowls_club> s:captain <#bob> >> ;
     s:startDate "01-01-2019"^^s:Date ;
     s:endDate "31-12-2019"^^s:Date.

and

<#bowls_club> s:captain <#bob> {|
     s:realization [
         a s:Event ;
         s:startDate "01-01-2019"^^s:Date ;
         s:endDate "31-12-2019"^^s:Date
     ]
|}.

>
> It seems natural to me that every triple should have start and end 
> time positions and possibly also a location position. The above 
> examples seem to me like different ways of saying the same thing, 
> albeit the first has more structure. You could argue that schema:Event 
> is just a convenience type for statements with temporal data.
>
> YAGO knowledge base is a good example: 
> https://www.sciencedirect.com/science/article/pii/S0004370212000719

>
> Regards
> Anthony
>
>
> On Fri, Dec 10, 2021 at 8:20 AM Cox, Simon (L&W, Clayton) 
> <Simon.Cox@csiro.au> wrote:
>
>     Captain of the bowls club is another example.
>
>     (I was in one of these the other day admiring the wooden honour
>     boards – the same names come up repeatedly but not necessary
>     sequentially.)
>
>     *From:*Dan Brickley <danbri@google.com>
>     *Sent:* Thursday, 9 December, 2021 22:57
>     *To:* public-rdf-star@w3.org
>     *Subject:* OnAgainOffAgain relations - beyond celeb marriage: Org
>     membership
>
>     The celebrity re-marriage example is interesting and real, but may
>     look a bit artificial or cornercase. A similarly structured
>     situation is much more common - membership of organizations.
>
>     For example one organization being a member of another.
>
>     https://www.wikidata.org/wiki/Q51698517 is the International Fact
>     Checking Network (IFCN). It has a notion of membership grounded in
>     review of members w.r.t. their official principles.
>
>     Verified signatories are e.g.
>     https://www.wikidata.org/wiki/Q30325238 (Full Fact). There are
>     some organizations such as Snopes
>     (https://www.wikidata.org/wiki/Q2287154) who were once members
>     (verified signatories) but who are not currently.
>
>     Wikidata uses annotations on a
>     https://www.wikidata.org/wiki/Property:P463 edge between IFCN and
>     Snopes to give start/end times (
>
>     15 April 2017, 5 June 2019). It also points to evidence/source
>     document.
>
>     As far as I know Snopes have only been members once, but if they
>     were to rejoin it seems Wikidata could accomodate the task of
>     representing this.
>
>     Until I learn a better name for it that isn't too grandiose, I am
>     calling these "on again, off again" relationships, in honour of
>     the celebrity marriage/divorce usecase.
>
>     Dan
>
>     p.s. another example, not quite notable enough for Wikidata to record:
>
>     I (https://www.wikidata.org/entity/Q56641640) have twice been a
>     member of https://www.wikidata.org/wiki/Q7552326 (AISB - Society
>     for the Study of Artificial Intelligence and Simulation of
>     Behaviour).  But then I have multiple times lived in the U.K., or
>     been in various restaurants; how do we scope RDF-Star's
>     applicability? Which of these are reasonable places it could be
>     used for time-scoped relationships?
>