Thanks for your quick answer.
>DESCRIBE looks in the default graph to get the description so I'll guess
>that your fuseki involves the union default graph otherwise I can't
>explain the first (correct) results.
Do that mean that the default union graph contains all the triple of the triple
store ? ( I'm not sure I really understand this quote )
Because if I use the query "SELECT ?s ?p ?o WHERE {?s ?p ?o}" without any
"from/from named" clause I don't obtain any result. So the default graph must
be empty.
I was expecting the result of "DESCRIBE ex:Alice FROM ex:a_graph" be the same
result of the query "SELECT ?s ?p ?o FROM ex:a_graph WHERE { ?s ?p ?o FILTER (
?s = ex:Alice ) }" and it's not.
Does default graph isn't the same for select and describe queries ?
>Hi Arthur,
>
>DESCRIBE looks in the default graph to get the description so I'll guess
>that your fuseki involves the union default graph otherwise I can't
>explain the first (correct) results.
>
>Also, I guess you using TDB else the FROM isn't going to work as there
>isn't a graph at the web URL http://example.com#Alice.
>
>If so, then the second second DESCRIBE executes the pattern (there isn't
>one given so it's the empty patter) on the FROM graph but uses the
>default graph of the dataset to fulfil the DESCRIBEing part. As before,
>that's all triples.
>
>If you want more control, consider using CONSTRUCT, otherwise you may
>need to provide your own DESCRIBE handler.
>
> Andy
>
>On 06/06/13 09:29, Arthur Vaïsse-Lesteven wrote:
>> Hi,
>>
>> I have created a totally new data set on my computer, and executed the
>> following update request :
>>
>> prefix ex:<http://example.com#>
>>
>>
>> INSERT DATA {
>>
>> GRAPH ex:a_graph {
>> ex:Alice ex:like ex:cats .
>> }
>>
>>
>>
>> GRAPH ex:meta_data_graph {
>> ex:a_graph ex:author ex:Bob.
>>
>> ex:Alice ex:IsDescribedIn ex:a_graph.
>> }
>>
>> }
>>
>> My data set contains now 2 graphs with minimal triples.
>>
>> I now use the following SPARQL request :
>>
>> prefix ex:<http://example.com#>
>> DESCRIBE ex:Alice
>>
>> This request give me the following result ( XML formated )
>> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>> xmlns:ex="http://example.com#";> <rdf:Description
>> rdf:about="http://example.com#Alice";> <ex:IsDescribedIn
>> rdf:resource="http://example.com#a_graph"/> <ex:like
>> rdf:resource="http://example.com#cats"/> </rdf:Description></rdf:RDF>
>>
>> That the answer that I expected, but now if I send this request :
>>
>> prefix ex:<http://example.com#>
>> DESCRIBE ex:Alice
>> FROM ex:a_graph
>>
>> I got the same result :
>> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>> xmlns:ex="http://example.com#";> <rdf:Description
>> rdf:about="http://example.com#Alice";> <ex:IsDescribedIn
>> rdf:resource="http://example.com#a_graph"/> <ex:like
>> rdf:resource="http://example.com#cats"/> </rdf:Description></rdf:RDF>
>>
>>
>> I was expecting that only the triple "Alice like cats" as a result. The
>> other triple isn't stored in the graph ex:a_graph and I was expecting it was
>> not in the result.
>>
>>
>> Do I made a mistake anywhere ? Do it is the normal result ?
>>
>> NB : I executed this 3 SPARQL queries on the web interface of a fuseki server
>>
>> Sincerelly.
>>
>> VAISSE-LESTEVEN Arthur.
>>
