SPARQL query to identify Graph URI (ignore Included graphs)

[Dan Segal]

Hello,

I need to identify a Graph URI, or alternatively the metadata:idenfitier value, where the query returns only for the local graph, ignoring any included graphs.

For example:

SELECT ?graph ?id
WHERE {
?graph metadata:identifier ?id
  }

returns:

graph                             id

urn:x-evn-master:graph1           graph1

urn:x-evn-master:graph2           graph2

urn:x-evn-master:graph3           graph3

where:

• graph1 is the local graph
• graph2 and graph3 are Includes
• The Graph URIs for all graphs are unknown in advance
  

How can I filter the query so that it returns only values from graph1, excluding values from graph2 and graph3?

Note: In EDG, checking "Return local results only" in the SPARQL Query panel returns the desired result.  However, I need to include the filtering syntax within the SPARQL query itself.

Thanks,

Dan

  

[Holger Knublauch]

Hi Dan,

you can use this fragment to get the "main" active graph

PREFIX teamwork: <http://topbraid.org/teamwork#>

SELECT *

WHERE {

   BIND (teamwork:currentMasterGraph() AS ?graph) 

}

from the SPARQL endpoint and the SPARQL panel, assuming the currently active query graph is an asset collection.

Using this ?graph you can query fields like the metadata:identifier

HTH

Holger

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[David Price]

Normal SPARQL can do this too in the general case:

FILTER NOT EXISTS { ?graphx owl:imports ?graph . }

Cheers,

David

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[Holger Knublauch]

Yes that's a more general solution that should also work well, except in cases of cyclic owl:imports where some other asset collection also happens to owl:import the main one.

Holger

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[Dan Segal]

Thank you, Holger and David for those suggestions.   Both very helpful...much appreciated!

Regards,

Dan