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.
