Generates a SPARQL not exists test.
not exists
Empty clauses are dropped; when none survives, the result is the empty fragment.
The graph pattern clauses
The not exists { … } test, or the empty fragment for no patterns
not exists { … }
SPARQL 1.1 Filter Exists
Generates a SPARQL
not existstest.Empty clauses are dropped; when none survives, the result is the empty fragment.