inference rule set and data in different graphs

[gangf...@gmail.com]

Hi,

I want to load the RDFS rule set in a named graph, and load the data in a separate named graph different from rule set.

Then I want to run query with inference turned on:

bin/stardog query "nary;reasoning=RDFS" test.sparql

I found the inference cannot work in this way. The only I can make inference work is that I need to load both rule set and data into the default graph....

Am I wrong? Is there anything I missed?

Thank you very much!

Best,

Gang

[Mike Grove]

Yes.  If you going to put your tbox in a graph other than the default, you have to tell Stardog where you've put it [1]; by default, it will only look in the default graph.

Cheers,

Mike 

[1] http://docs.stardog.com/#_using_reasoning

Thank you very much!

Best,

Gang

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[Gang Fu]

Hi Mike,

Thank you for your reply. Here is what I have done:

1) create db can point the reasoning schema to both default graph and a named graph called 'http://tbox':

bin/stardog-admin db create -o reasoning.schema.graphs=default,http://tbox -n testDB

2) load the rule set to both default graph and the 'http://tbox'

bin/stardog data add -g http://tbox testDB <my rule set file>

3) load the data into another named graph called 'http:abox':

bin/stardog data add -g http://abox testDB  <my data file>

Then I try a query with inference required to run, and I got nothing back:

either:

bin/stardog query execute --reasoning RDFS testDB <my query file>

bin/stardog query "testDB;reasoning=RDFS"  <my query file>

However, if I load data into default graph (now both rule set and data are in default graph), when I run the same query, I can get some results.

Best,

Gang

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[Héctor Pérez-Urbina]

Are you specifying the named graph containing the ABox in the query?

Best,
Héctor

[Gang Fu]

Hi Hector,

I just provided the db name, here is how I did query:

bin/stardog query "testDB;reasoning=RDFS"  <my query file>

testDB is the db having both Abox and Tbox...how can I provide the named graph in query?

Best,

Gang

[Evren Sirin]

You can use FROM or GRAPH clauses in your query. See the SPARQL spec
[1] for details. Also see this FAQ entry [2] querying named graphs.

Best,
Evren

[1] http://www.w3.org/TR/sparql11-query/#specifyingDataset
[2] http://docs.stardog.com/#_why_don_t_my_queries_work

[Gang Fu]

If you mean in the query, yes, definitely, I have 'from' clause in my query, I though you were talking about stardog specific graph parameter....

[Gang Fu]

By the way,here is the log file:

WARNING: There was a problem determining the types of the query variables. Reasoning will not be performed.

Mar 12, 2015 2:40:57 PM com.complexible.stardog.reasoning.blackout.PlanRewriter$Rewriter transform

[Kendall Clark]

Please read the fine manual; it covers this issue explicitly.

Cheers,

Kendall Clark