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Re: divergence in the definition of sh:minCount

From: Dimitris Kontokostas <kontokostas@informatik.uni-leipzig.de>
Date: Mon, 26 Sep 2016 10:30:02 +0300
Message-ID: <CA+u4+a3Tv=NyTWg4+n9JeD6nWa7VbTmuF0QFzRgo7Lwq6iSJxw@mail.gmail.com>
To: "Peter F. Patel-Schneider" <pfpschneider@gmail.com>
Cc: "public-rdf-sha." <public-rdf-shapes@w3.org>
Hi Peter,

I tried your example and I got 4 "value nodes" back which is in line with
the duplicate value node comment above.

I am trying to see the problem here, is it the following wording from
section 4?
"For property constraints that have a sh:path the value nodes are the
objects in the data graph that can be reached by following the given
property path starting with the focus node as subject based on the
evaluation rules defined by SPARQL 1.1"

I think this can be improved but I cannot see if there is a wrong
definition there.

Thanks,
Dimitris

On Sun, Sep 25, 2016 at 12:43 AM, Peter F. Patel-Schneider <
pfpschneider@gmail.com> wrote:

> Even if you "count all nodes, even duplicates", there is still a violation
> in
>
> Data:
>   :john :child :bill .
>   :john :son :bill .
>   :john :child :mary .
>   :john :daughter :mary .
>
> Shape
>   s:s1 rdf:type sh:Shape ;
>     sh:targetNode :john ;
>     sh:property [ sh:path [ sh:alternativePath ( :child :son :daughter ) ]
> ;
>                   sh:minCount 3 ] .
>
> If something other than "A validation result must be produced if the
> number of
> value nodes is less than the value of sh:minCount." is desired then this
> wording can no longer be used, particularly given the wording about
> path-based
> property constraints at the beginning of Section 4.
>
> peter
>
>
>
> On 09/24/2016 07:12 AM, Dimitris Kontokostas wrote:
> > Hi Peter,
> >
> > is this about the fact that property paths might return duplicate value
> nodes
> > or something else?
> > In this case, we count all nodes, even duplicates for cardinality
> restrictions
> >
> > Thanks,
> > Dimitris
> >
> > On Fri, Sep 23, 2016 at 9:17 PM, Peter F. Patel-Schneider
> > <pfpschneider@gmail.com <mailto:pfpschneider@gmail.com>> wrote:
> >
> >     The textual and SPARQL definitions of sh:minCount do not align when
> paths
> >     are allowed.
> >
> >
> >     A validation result must be produced if the number of value nodes is
> less
> >     than the value of sh:minCount.
> >
> >     SELECT $this
> >     WHERE {OPTIONAL {$this $PATH ?value .}}
> >     GROUP BY $this
> >     HAVING (COUNT(?value) < $minCount)
> >
> >
> >
> >     Peter F. Patel-Schneider
> >     Nuance Communications
> >
> >
> >
> >
> > --
> > Dimitris Kontokostas
> > Department of Computer Science, University of Leipzig & DBpedia
> Association
> > Projects: http://dbpedia.org, http://rdfunit.aksw.org,
> http://aligned-project.eu
> > Homepage: http://aksw.org/DimitrisKontokostas
> > Research Group: AKSW/KILT http://aksw.org/Groups/KILT
> >
>
>


-- 
Dimitris Kontokostas
Department of Computer Science, University of Leipzig & DBpedia Association
Projects: http://dbpedia.org, http://rdfunit.aksw.org,
http://aligned-project.eu
Homepage: http://aksw.org/DimitrisKontokostas
Research Group: AKSW/KILT http://aksw.org/Groups/KILT
Received on Monday, 26 September 2016 07:31:00 UTC

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