Generates a SPARQL UNION pattern.
UNION
Several clauses are each wrapped in a group and joined with union, while a single one is returned as is. Empty clauses are dropped; when none survives, the result is the empty fragment.
union
The alternative graph patterns
The SPARQL UNION pattern
SPARQL 1.1 Alternative Patterns
Generates a SPARQL
UNIONpattern.Several clauses are each wrapped in a group and joined with
union, while a single one is returned as is. Empty clauses are dropped; when none survives, the result is the empty fragment.