Generates a SPARQL SERVICE block.
SERVICE
Empty clauses are dropped; when none survives, the result is the empty fragment.
The serialised endpoint: a variable or an IRI reference
The graph pattern clauses
The SPARQL SERVICE block, or the empty fragment for no clauses
SPARQL 1.1 Federated Query — SERVICE
Generates a SPARQL
SERVICEblock.Empty clauses are dropped; when none survives, the result is the empty fragment.