Adds SPARQL endpoint deduction capability to SPARQL-FED. Usage requires granting a new ROLE to SPARQL user account. Once granted, Virtuoso makes a best-attempt to determine the capabilities of a SPARQL endpoint by looking up its SPARQL Service Description Document, if available, and/or executing a series of SPARQL test queries (e.g., testing whether SPARQL Query results may be returned in all formats outlined by the W3C SPARQL spec).
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