It was not my question, but again, the property path * operator is used
in his query - and this can also mean 0 occurrences of the relation
rdfs:subClassOf . Maybe I don't understand the meaning of * - I'll check
the W3C recommendation.
In the meantime, I tried it with the following minimal example and
Apache Jena 3.1.0
Dataset
@prefix ex:<http://example.org/test/> .
ex:a a ex:A .
Query 1
PREFIX ex: <http://example.org/test/>
select * where {
?s a ex:A .
}
Result 1
--------
| s |
====
| ex:a |
--------
Query 2
PREFIX ex: <http://example.org/test/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select * where {
?s a ?cls .
?cls rdfs:subClassOf ex:A
}
Result 2
EMPTY RESULT (as expected as there is no rdfs:subClassOf triple in the data)
Query 3 (with property path)
PREFIX ex: <http://example.org/test/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select * where {
?s a ?cls .
?cls rdfs:subClassOf* ex:A
}
Result 3
-----------------
| s | cls |
========
| ex:a | ex:A |
-----------------
Query 4 (with property path sequence / and *)
PREFIX ex: <http://example.org/test/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select * where {
?s a/rdfs:subClassOf* ex:A
}
Result 4
--------
| s |
====
| ex:a |
--------
But maybe Jena is wrong here(although it returns what I would expect,
but I'm not a SPARQL expert). I'll try to contact one of the developers.
Regards,
Lorenz
On 09.01.2017 12:53, Kingsley Idehen wrote:
> On 1/9/17 5:38 AM, Lorenz Buehmann wrote:
>>
>> @Hugh : the asterisk operator means 0 .. n occurrences, thus,
>>
>>
>> #constraint 1
>> ?A rdf:type ?A_SubClassOf.
>> ?A_SubClassOf rdfs:subClassOf* :mytype1.
>>
>>
>> should also cover the case
>>
>>
>> ?A rdf:type :mytype1 .
>>
>>
>> Or am I wrong?
>>
>>
>> I mean the property path expression should also work and is
>> equivalent to the constraint
>>
>> ?A rdf:type/rdfs:subClassOf* :mytype1 .
>>
>>
>> Cheers,
>>
>> Lorenz
>>
>
> Lorenz,
>
> You are using rdfs:subClassOf in your query, but it doesn't exist in
> your dataset. Putting it in a property path doesn't magically create
> what's missing in your dataset.
>
> Kingsley
>>
>>
>> On 09.01.2017 00:50, Hugh Williams wrote:
>>> Hi Oliver,
>>>
>>> There are no rdfs:subClassOf or rdfs:subPropertyOf relations in the
>>> graph of the inserted data:
>>>
>>> SQL> SPARQL SELECT * FROM <mygraph> WHERE {?s ?p ?o};
>>> s
>>> p
>>> o
>>> LONG VARCHAR
>>> LONG VARCHAR
>>> LONG VARCHAR
>>> _______________________________________________________________________________
>>>
>>> urn:my:graphX1
>>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
>>> urn:my:graphmytype2
>>> urn:my:graphX2
>>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
>>> urn:my:graphmytype2
>>> urn:my:graphC
>>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
>>> urn:my:graphmytype1
>>> urn:my:graphB
>>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
>>> urn:my:graphmytype1
>>> urn:my:graphA
>>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
>>> urn:my:graphmytype1
>>> urn:my:graphC
>>> urn:my:graphmyrel
>>> urn:my:graphX1
>>> urn:my:graphA
>>> urn:my:graphmyrel
>>> urn:my:graphX1
>>> urn:my:graphB
>>> urn:my:graphmyrel
>>> urn:my:graphX2
>>>
>>> 8 Rows. -- 5 msec.
>>> SQL>
>>>
>>> Please refer to the following documentation on Virtuoso inference
>>> and reasoning and rdfs:subClassOf & rdfs:subPropertyOf support …
>>>
>>> http://docs.openlinksw.com/virtuoso/rdfsparqlrulesubclassandsubprop/
>>>
>>> Best Regards
>>> Hugh Williams
>>> Professional Services
>>> OpenLink Software, Inc. // http://www.openlinksw.com/
>>> Weblog -- http://www.openlinksw.com/blogs/
>>> LinkedIn -- http://www.linkedin.com/company/openlink-software/
>>> Twitter -- http://twitter.com/OpenLink
>>> Google+ -- http://plus.google.com/100570109519069333827/
>>> Facebook -- http://www.facebook.com/OpenLinkSoftware
>>> Universal Data Access, Integration, and Management Technology Providers
>>>
>>>
>>>
>>>> On 6 Jan 2017, at 09:42, Olivier Filangi <olivier.fila...@inra.fr>
>>>> wrote:
>>>>
>>>> Dear all,
>>>>
>>>> I have a strange behaviour with a kind of query with Virtuoso
>>>> (07.20.3217).
>>>>
>>>> Accoding the following tripplet I put with a insert query :
>>>>
>>>> PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> PREFIX :<urn:my:graph>
>>>>
>>>>
>>>> INSERT DATA
>>>> {
>>>> GRAPH <mygraph> {
>>>> :A rdf:type :mytype1.
>>>> :B rdf:type :mytype1.
>>>> :C rdf:type :mytype1.
>>>>
>>>> :X1 rdf:type :mytype2.
>>>> :X2 rdf:type :mytype2.
>>>>
>>>> :A :myrel :X1.
>>>> :B :myrel :X2.
>>>> :C :myrel :X1.
>>>> }
>>>> }
>>>>
>>>> When I request with on data with the query :
>>>>
>>>> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
>>>> PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> PREFIX :<urn:my:graph>
>>>>
>>>> SELECT DISTINCT ?A ?B
>>>> WHERE
>>>> {
>>>> ?A ?subProperty8 ?B.
>>>> ?subProperty8 rdfs:subPropertyOf* :myrel.
>>>>
>>>> #constraint 1
>>>> ?A rdf:type ?A_SubClassOf.
>>>> ?A_SubClassOf rdfs:subClassOf* :mytype1.
>>>>
>>>> #constraint 2
>>>> ?B rdf:type ?B_SubClassOf.
>>>> ?B_SubClassOf rdfs:subClassOf* :mytype2.
>>>> }
>>>>
>>>> I get only one result :
>>>> urn:my:graphA urn:my:graphX1
>>>>
>>>> If I remove the first or the second constraint, I get all results
>>>> that I
>>>> should find :
>>>> urn:my:graphA urn:my:graphX1
>>>> urn:my:graphC urn:my:graphX1
>>>> urn:my:graphB urn:my:graphX2
>>>>
>>>> Could you say me if I did a wrong sparql insertion/request or if
>>>> it's a
>>>> bug ?
>>>>
>>>> Regards,
>>>> Olivier F.
>>>>
>>>>
>>>> --
>>>> Filangi Olivier
>>>> +33 (0)2 23 48 51 48
>>>> Biodiversity and Polyploidy team - UMR1349 IGEPP - INRA -
>>>> Agrocampus Ouest
>>>> +33 (0)2 99 84 74 22
>>>> GenOuest Bioinformatics Platform - IRISA
>>>>
>>>>
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>>>
>>>
>>>
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>>
>>
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>
>
> --
> Regards,
>
> Kingsley Idehen
> Founder & CEO
> OpenLink Software (Home Page: http://www.openlinksw.com)
>
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>
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