Re: [dotNetRDF-Support] NamespaceMapper doesn't find prefix

[Rob V. <rv...@do...>]

Frank

All names spaces for queries must be declared in the query. Queries are parsed without any reference to the data on which they will evaluate must be entirely self-contained.

 Please note that project is undergoing a change of leadership and infrastructure and that these mailing lists will close in the near future. Please ask any future questions on GitHub at http://github.com/dotnetrdf/dotnetrdf/issues

Rob


On 16/06/2016 15:52, "Frank Schumacher" <fs...@in...> wrote:

Hi folks,

I have strange problem with the IGraph.ExecuteQuery(string s) method. 
For the following query-string:

SELECT * where { ?releaseGroupURI a mbo:ReleaseGroup. ?releaseGroupURI 
mbo:musicBrainzId ?mbId. FILTER (REGEX(STR(?mbId), 
"c9744809-c5b8-4d3c-a115-1a3daa881c09", "i")). OPTIONAL 
{?releaseGroupURI rdfs:comment ?comment} }

I get the following error:

{"The Namespace URI for the given Prefix 'mbo' is not known by the 
in-scope NamespaceMapper.  Did you forget to define a namespace for this 
prefix?"}

But I DID defined the prefix beforehand:
graph.NamespaceMap.AddNamespace("mbo", new 
Uri("http://creativeartefact.org/ontology/"));

I double checked it in the local variable window of my Visual Studio and 
also entered the line

graph.NamespaceMap.GetNamespaceUri("mbo");

in the direct window, which yields the expected result.

If I add "PREFIX mbo: <http://creativeartefact.org/ontology/> " in front 
of my query, everything works fine.

Any idea, why the NamespaceMapper doesn't find the defined prefix(es - 
same with rdfs.)?


Thanks in advance,
Frank


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