Yes, and the underlying issue is that sh:prefixes will follow the
owl:imports closure but while editing in EDG those owl:imports will be
attached to the Home resource urn:x-evn-master:XY which is different
from the external namespace resource. You could theoretically declare
your prefixes at the external graph URI
ex:MyGraph
a owl:Ontology ;
owl:imports <http://datashapes.org/dash> ;
sh:declare [ ... ]
.
and then do sh:prefixes ex:MyGraph in your SPARQL query.
In either case, this is a common pain point for SHACL users that
unfortunately was required because RDF graphs do not have a concept of
prefixes (which are an aspect of the serialization only), yet SHACL is
serialization-agnostic.
Holger
On 2021-06-02 2:20 am, Irene Polikoff wrote:
On Jun 1, 2021, at 4:39 AM, Jan Voskuil <[email protected]
<mailto:[email protected]>> wrote:
Hi,
While trying to familiarize myself with sh:values in EDG, I fail to
get the results I think I expect using sh:prefixes. I’ve read the
spec and Holger’s mail dd March 22 2021 on this topic in this forum.
In TopBraid Examples Geo Ontology, I added a values property shape to
g:GeoConcept that counts the number of narrowers, see [1]. It works
as expected.
But I had to use sh:prefixes as in [2], with the urn-URI. When using
the “external graph URI” as the graphURI as in [3], the prefix
declaration is not found, even though I did set this parameter on the
settings tab, as seen under [4].
The external graphURI is to be used as value of owl:imports*, so I
would expect [3] to work, or is this by design? -j
Right, the external graph URI only works for import/export and
re-directs of owl:imports, not in SPARQL. You do need to refer to the
actual URI that has prefix declarations.
Btw, Your declarations in (4) seem to be missing quotes around the
namespaces. They should be
sh:declare [
sh:namespace "http://topquadrant.com/ns/examples/geography
<http://topquadrant.com/ns/examples/geography>#"^^xsd:anyURI ;
sh:prefix "g" ;
] ;
You probably already know this, but just in case - if you decide to
declare a prefix in the query, use:
sh:values [
sh:prefixes [
sh:declare [
sh:namespace "http://www.w3.org/2004/02/skos/core
<http://www.w3.org/2004/02/skos/core>#"^^xsd:anyURI ;
sh:prefix "skos" ;
] ;
] ;
sh:select """
SELECT COUNT(?n)
WHERE {
?n skos:broader ?this .
}
""" ;
] ;
Also, there is no need to use SPARQL for this particular example. You
could do the following:
skos:Concept-countOfChildren
a sh:PropertyShape ;
sh:path g:countOfChildren ;
sh:datatype xsd:integer ;
sh:name "count of children" ;
sh:values [
sh:count [
sh:path [
sh:inversePath skos:broader ;
] ;
] ;
] ;
.
[1]
<image002.png>
[2]
g:GeoConcept-numberOfNarrowers
a sh:PropertyShape ;
sh:path g:numberOfNarrowers ;
sh:datatype xsd:integer ;
sh:maxCount 1 ;
sh:name "number of narrowers" ;
sh:values [
sh:prefixes <urn:x-evn-master:geography_ontology> ;
sh:select """
SELECT COUNT(?n)
WHERE {
?n skos:broader ?this .
}
""" ;
] ;
.
[3]
sh:prefixes <http://topquadrant.com/ns/examples/geography#
<http://topquadrant.com/ns/examples/geography#>> ;
or
sh:prefixes g: ;
[4]
<urn:x-evn-master:geography_ontology>
a owl:Ontology ;
metadata:status metadata:UnderDevelopmentStatus ;
swa:defaultNamespacehttp://topquadrant.com/ns/examples/geography#
<http://topquadrant.com/ns/examples/geography#>;
teamwork:externalGraphURI g: ;
rdfs:comment "Schema definition for Geography Taxonomy." ;
rdfs:label "TopBraid Examples Geo Ontology" ;
owl:importshttp://datashapes.org/dash <http://datashapes.org/dash>;
owl:importshttp://datashapes.org/graphql
<http://datashapes.org/graphql>;
owl:importshttp://spinrdf.org/spl <http://spinrdf.org/spl>;
owl:importshttp://topbraid.org/skos-xl.shapes
<http://topbraid.org/skos-xl.shapes>;
owl:importshttp://topbraid.org/skos.shapes
<http://topbraid.org/skos.shapes>;
owl:importshttp://topbraid.org/tbgeo <http://topbraid.org/tbgeo>;
owl:importshttp://topbraid.org/teamworkconstraints
<http://topbraid.org/teamworkconstraints>;
sh:declare [
sh:namespacehttp://topquadrant.com/ns/examples/geography#
<http://topquadrant.com/ns/examples/geography#>^^xsd:anyURI ;
sh:prefix "g" ;
] ;
sh:declare [
sh:namespacehttp://www.w3.org/2004/02/skos/core#
<http://www.w3.org/2004/02/skos/core#>^^xsd:anyURI ;
sh:prefix "skos" ;
] ;
sh:declare [
sh:namespacehttp://www.wikidata.org/prop/direct/
<http://www.wikidata.org/prop/direct/>^^xsd:anyURI ;
sh:prefix "wdt" ;
] ;
.
*Jan Voskuil*| CEO Taxonic
Veldzigt 2, 3454 PW,De Meern, The Netherlands
T+31 (0)88 829 66 00| M:+31 (0)6 14488335
[email protected]
<mailto:[email protected]>|www.taxonic.com
<http://www.taxonic.com/>
Registered office in Den Haag, The Netherlands
Registration Number Chamber of Commerce: 54529190
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