Re: [topbraid-users] shacl import?

Thu, 17 Jan 2019 16:09:00 -0800 


On 18/01/2019 7:15 am, Rob Atkinson wrote:
its an area where URIs are not "opaque" - because when dereferencing a server never sees the # or trailing fragments after that. 


If you use a # in your URI you are saying that architecturally a 
client must always load the entire namespace when referencing a single 
term - which is appropriate for models but not instance data usually. 
clients need the ability to choose how many instances they are dealing 
with, and some other mechanism should be provided to access lists of 
instances.



Arguably TBC should fully simulate HTTP dereferencing - and be willing 
to match with or without trailing # ?



TopBraid will have no problems resolving either with or without # from 
the web, but if you have owl:imports in an RDF model then the 
interpretation should IMHO be that it refers to the URI (usually an 
owl:Ontology) in that location to resolve further recursive owl:imports. 
In other words, if you have a union graph with all sub-graphs, you can 
use the SPARQL path owl:imports* to find all imported sub-graphs. That's 
also how SHACL interprets them. Just pretending they are the same is 
creating complications wherever such references (in the RDF model) are 
followed, e.g. you'd need to make SPARQL queries look for either case 
too. For this reason, the mapping of URIs to local files only accepts 
exact matches.


Holger







On Thu, 17 Jan 2019 at 19:38, Holger Knublauch <hol...@topquadrant.com 
<mailto:hol...@topquadrant.com>> wrote:


    Using # or not does/can impact how further owl:imports are
    understood. So if shacl# had an owl:import and you just import
    without the # then the owl:import would not be picked up because
    it's a different owl:Ontology.

    This is one of these never-ending topics where the semantic web
    stack is unfortunately too complex and almost everybody gets this
    wrong.

    Holger


    On 17/01/2019 6:32 pm, 'Bohms, H.M. (Michel)' via TopBraid Suite
    Users wrote:


    Ok

    Is there any special reason why the ‘importing with #’is
    different from usual (without #, # only in prefix)?

        

    Dr. ir. H.M. (Michel) Böhms
    Senior Data Scientist

        

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    *From:*topbraid-users@googlegroups.com
    <mailto:topbraid-users@googlegroups.com>
    <topbraid-users@googlegroups.com>
    <mailto:topbraid-users@googlegroups.com> *On Behalf Of *Holger
    Knublauch
    *Sent:* donderdag 17 januari 2019 09:30
    *To:* topbraid-users@googlegroups.com
    <mailto:topbraid-users@googlegroups.com>
    *Subject:* Re: [topbraid-users] shacl import?

    Only importing will add the triples from that namespace. Simply
    using the URIs does not.

    Holger

    Sent from my iPad


    On 17 Jan 2019, at 18:26, 'Bohms, H.M. (Michel)' via TopBraid
    Suite Users <topbraid-users@googlegroups.com
    <mailto:topbraid-users@googlegroups.com>> wrote:

        Ok

        But when it is deref. that way…why still need to import it
        (at all)?

                

        Dr. ir. H.M. (Michel) Böhms
        Senior Data Scientist


                

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        *From:*topbraid-users@googlegroups.com
        <mailto:topbraid-users@googlegroups.com>
        <topbraid-users@googlegroups.com
        <mailto:topbraid-users@googlegroups.com>> *On Behalf Of
        *Holger Knublauch
        *Sent:* donderdag 17 januari 2019 00:05
        *To:* topbraid-users@googlegroups.com
        <mailto:topbraid-users@googlegroups.com>
        *Subject:* Re: [topbraid-users] shacl import?

        The correct URI to import is http://www.w3.org/ns/shacl#
        <http://www.w3.org/ns/shacl> (including the #) and this
        should be dereferenceable. In TopBraid, this will redirect to
        the local copy in the TopBraid/SHACL/shacl.ttl file.

        Holger

        On 16/01/2019 10:34 pm, 'Bohms, H.M. (Michel)' via TopBraid
        Suite Users wrote:

            Can someone help me remember:

            Do I need

            <https://w3id.org/example1> <https://w3id.org/example1>

            rdf:type owl:Ontology ;

            owl:imports dct: ;

            owl:imports <http://www.w3.org/2004/02/skos/core>
            <http://www.w3.org/2004/02/skos/core> ;

              owl:imports <http://www.w3.org/ns/shacl>
            <http://www.w3.org/ns/shacl> .

            or is it dereferenceable

            thx a lot, Michel

                

            Dr. ir. H.M. (Michel) Böhms
            Senior Data Scientist



                

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