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Re: on ontologies/vocabulary

From: Peter F. Patel-Schneider <pfpschneider@gmail.com>
Date: Mon, 26 Sep 2016 08:35:30 -0700
To: Dimitris Kontokostas <kontokostas@informatik.uni-leipzig.de>
Cc: "public-rdf-shapes@w3.org" <public-rdf-shapes@w3.org>
Message-ID: <3957127e-ee6f-c143-07fc-b44c7b1adb96@gmail.com>
Here is the revised wording, as far as I can tell:

The same mechanism applies for ontologies and vocabularies, or simply schemas.
A schema can suggest which shapes graphs should be used for validating data
graphs that use the schema and SHACL processors MAY use this information. This
suggestion is instantiated in the schema documents where every value for the
property sh:shapesGraph denotes a suggested shapes graph. When the schema is
identified by a schema IRI or a version IRI, this IRI SHOULD be the subject of
these triples.

The problem is still that SHACL does not have a notion of ontologies or
vocabularies or schema for data graphs.  All that a SHACL processor gets is an
RDF graph.  This is in contrast with shapes graphs, where owl:imports may be
used to combine multiple shapes graphs.


On 09/26/2016 07:45 AM, Dimitris Kontokostas wrote:
> Thanks for the feedback Peter,
> I tried to reuse some OWL definitions to make this clear
> <https://github.com/w3c/data-shapes/commit/9fe3186944e4ace455142935ab8bfa6a528cf740>.
> I hope that by referencing OWL I didn't get into a new pitfall.
> Best,
> Dimitris
> On Mon, Sep 26, 2016 at 9:35 AM, Peter F. Patel-Schneider
> <pfpschneider@gmail.com <mailto:pfpschneider@gmail.com>> wrote:
>     "The data graph is expected to include all the ontology axioms related to
>     the data and especially all the rdfs:subClassOf triples in order for SHACL
>     to correctly identify class targets and validate Core SHACL constraints."
>     "The same mechanism applies for ontologies or vocabularies. The ontology or
>     the vocabulary IRI can point to one or more graphs with the predicate
>     sh:shapesGraph.  A SHACL processor MAY take this information into account to
>     determine which shapes graph to use for validating a data graph that uses
>     that ontology or vocabulary."
>     There is no defined notion that can be used to support "the ontology or
>     vocabulary IRI".
>     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
Received on Monday, 26 September 2016 15:36:01 UTC

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