Heuristics-based Query Reordering for Federated Queries in SPARQL 1.1 and SPARQL-LD

Thanos Yannakis, Pavlos Fafalios, Yannis Tzitzikas

The federated query extension of SPARQL 1.1 allows executing queries distributed over different SPARQL endpoints. SPARQL-LD is a recent extension of SPARQL 1.1 which enables to dir…