From W3C Wiki
This page collects approaches to federating SPARQL queries:
- ARQ has an explicit
SERVICEkeyword directs part of a query to a SPARQL endpoint (ARQ documentation).
- DARQ describes a system for automatically paritioning a query over SPARQL endpoints. (project not longer active?)
- SPARQLfed describes a
BINDINGSkeyword to pass bindings between SPARQL endpoints involved in federation. The work is being implemented by EricP as part of SPASQL for MySQL.
- ARC provides a procedural scripting language (SPARQLScript) that can combine distributed endpoints via its
ENDPOINTcommand. It cannot federate query parts (i.e. selected patterns of a single query), though.