Open world assumption and SPARQL in triple stores

Question

I would like to know if SPARQL, by default, adopts the open world assumption or if this depends on the triple stores that execute the SPARQL queries.

And what are th

Answer 1

SPARQL follows the Closed World Assumption and assumes RDF data to be complete. This does not affect positive queries, but SPARQL queries with negation make only sense under closed world semantics.