SPARQL: Querying the Default Graph

Question

With the RDF query language SPARQL, I'm trying to find a way to do a boolean query (or any other query) for anything not in a Named Graph.

ASK { GRAPH null { ?s ?p ?o } }

Can't find really any documentation on searching specifically within an empty Named Graph. Also tried replacing null with <>, empty, and (nothing).

`ASK { ?s ?p ?o }` is not working as expected? What is your triplestore? — Stanislav Kralin, Nov 01 '18 at 18:10
I'm using Allegrograph 6.1.5. The problem I'm seeing with that query is that it returns True if a triple exists within a specific Named Graph as well. — Neil Graham, Nov 01 '18 at 18:14
Try `ASK { GRAPH DEFAULT { ?s ?p ?o } }`. If it is not working, then is `SELECT FROM DEFAULT {?s ?p ?o}` returns what you need? — Stanislav Kralin, Nov 01 '18 at 18:23
And perhaps you could just add `PREFIX franzOption_defaultDatasetBehavior: ` in the beginning of your original query. — Stanislav Kralin, Nov 01 '18 at 18:27
Thanks! `SELECT * FROM DEFAULT {?s ?p ?o}` worked for querying an empty named graph. — Neil Graham, Nov 01 '18 at 19:17

score 2 · Accepted Answer · answered Nov 01 '18 at 19:16

2

This query will look for triples in the default graph, then remove ones that are also in a named graph:

SELECT ?s ?p ?o {
   ?s ?p ?o 
   FILTER NOT EXISTS { GRAPH ?g { ?s ?p ?o } }
}

answered Nov 01 '18 at 19:16

AndyS

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SPARQL: Querying the Default Graph

1 Answers1