Holger,
I am able to create a second property shape, ex:shape2, that uses the
values from my ex:shape1 in a very simple, non-transformative way and
successfully returns the values of ex:shape1 for ex:shape2:
ex:Class-shape2
a sh:PropertyShape ;
sh:path ex:shape2 ;
sh:class ex:Class
sh:values [
sh:path ex:shape1 ;
] ;
.
But the moment I try to introduce any more complexity, my sh:values
statement stops returning any results. For example, I tried:
sh:values [
sh:path ( ex:shape1 skos:broader ) ;
]
and got back no values for ex:shape2. (All of the values returned for
ex:shape1 have broader concepts, although they are defined in a different
EDG asset collection.)
What am I doing wrong?
thanks,
Carl
On Thursday, January 20, 2022 at 5:01:18 PM UTC-8 Holger Knublauch wrote:
>
> On 2022-01-21 10:54 am, [email protected] wrote:
>
> Thanks, Holger. My need in this case isn't to query inferred data using
> SPARQL or GraphQL, but rather to reuse the inferred data as an input for
> another EDG property shape with another sh:values rule in it. I think I'm
> hearing that that's not possible.
>
> That scenario IS possible. You just need to use a path node expression, see
>
> https://w3c.github.io/shacl/shacl-af/#node-expressions-path
>
> So if ex:prop1 is inferred then you can reference it in the sh:values rule
> of another property using [ sh:path ex:prop1 ] and it will compute that
> inference on the fly. This assumes that the receiving property using a
> sh:values rule using SHACL node expressions, not SPARQL.
>
> Holger
>
>
>
> Can you point me to where I can read more about the materialization option
> and decide whether there's a way to make that work for this use case?
> Thanks.
>
> On Tuesday, January 18, 2022 at 4:03:32 PM UTC-8 Holger Knublauch wrote:
>
>>
>> On 2022-01-19 9:44 am, [email protected] wrote:
>>
>> I have defined a property shape and am successfully inferring its objects
>> using a sh:values rule.
>>
>> Can you remind me whether it is possible to use this property and its
>> inferred data in the sh:values rule for a different property shape? If so,
>> is there a special way that it needs to be done -- like, does the data I
>> inferred in the first property shape need to be materialized in some way
>> before I can make use of it? --
>>
>> In general, the RDF graphs that TopBraid operates on do not automatically
>> "see" the extra inferred triples, so they are not computed as RDF triples
>> on the fly. However, our higher level query languages GraphQL and
>> JavaScript/ADS do see them whenever they are requested. The user interface
>> goes through GraphQL and will therefore display these values as if they
>> were materialized.
>>
>> Now, within SHACL itself it depends on what you want to do. If you have
>> SHACL-AF inference rules including other sh:values rules you can safely use
>> path expressions
>> https://w3c.github.io/shacl/shacl-af/#node-expressions-path and the
>> values will be computed on the fly. For SHACL constraints there is no such
>> mechanism unless you are expressing the constraints in SPARQL. There you
>> can use the magic property
>>
>> (?focusNode ?predicate) tosh:values ?result
>>
>> to query the inferred values.
>>
>> The other option, of course, is to materialize the inferences, e.g. using
>> the Inferences panel or the Transform tab.
>>
>> Does this help?
>>
>> Holger
>>
>>
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