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Blazegraph(TM) RDF Test Suites

There is a newer version: 2.1.4

# bindings with two variables and two sets of values
# Note: This is a variant of Federated Query service04 where the SERVICE keyword
# has been replaced by the GRAPH keyword and the data for the end point is just
# located in a local named graph by the same name as the end point.

PREFIX :  
PREFIX foaf:  
SELECT ?s ?o1 ?o2
{
  GRAPH  { ?s ?p1 ?o1 } 
  OPTIONAL { GRAPH  {?s foaf:knows ?o2 }}
} BINDINGS ?o2 {
 (:b)
}