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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 22:11:01 +0300
Message-ID: <CA+u4+a0pR7WbakoC2G6i8TDbX5uAfKXtn456an==47ufXoae3Q@mail.gmail.com>
To: "Peter F. Patel-Schneider" <pfpschneider@gmail.com>
Cc: "public-rdf-sha." <public-rdf-shapes@w3.org>
Maybe it is something very obvious but I still cannot see it.

however, I improved the wording for the property path value nodes. It was
using subject and object which was not correct, shapes can use also
literals as focus nodes
https://github.com/w3c/data-shapes/commit/f1d525b82ce8a74092826e768159db601270033a

On Mon, Sep 26, 2016 at 6:55 PM, Peter F. Patel-Schneider <
pfpschneider@gmail.com> wrote:

> You mean that you got back 4 results when running the SPARQL query.  That's
> different from "the number of value nodes", which is my point.
>
> peter
>
>
> On 09/26/2016 12:30 AM, Dimitris Kontokostas wrote:
> > 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 <mailto: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>
> >     <mailto: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
> >     <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
> >
>
>


-- 
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 19:11:58 UTC

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