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%META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---+How to discover the capabilities of a SPARQL endpoint to enhancing SPARQL-FED usage from Virtuoso instances using LOAD SERVICE ... DATA ---++What? How to discover the capabilities of a SPARQL endpoint en route to enhancing SPARQL-FED usage from Virtuoso instances using LOAD SERVICE ... DATA. ---++Why? There are features supported in Virtuoso SPARQL that aren't supported by other SPARQL engines. There are also a lot of Virtuoso instances behind bubbles in the LOD cloud. Net effect, a Virtuoso instance operator is faced with varied behavior when attempting to use SPARQL-FED functionality. ---++How? Run this command to load metadata (or lack thereof) from an external SPARQL endpoint: <verbatim> SPARQL LOAD SERVICE <sparql-endpoint-iri> DATA </verbatim> ---+++Example 1 Load [[http://lod.openlinksw.com][LOD]] SPARQL Endpoint data: <verbatim> SPARQL LOAD SERVICE <http://lod.openlinksw.com/sparql> DATA Query result: ANY Load service <http://lod.openlinksw.com/sparql> data -- done. Trying to query <http://lod.openlinksw.com/sparql> as SPARQL web service endpoint, POST mode... </verbatim> 2 Check the loaded data: <verbatim> SPARQL SELECT * FROM virtrdf: WHERE { <http://lod.openlinksw.com/sparql> ?p ?o } LIMIT 10 Query result: p o ANY ANY http://www.openlinksw.com/schemas/virtrdf#isEndpointOfService http://lod.openlinksw.com/sparql-sd http://www.openlinksw.com/schemas/virtrdf#dialect 000037ff </verbatim> ---++Additional Usage Benefits Suppose one queries a remote endpoint and get sort of <i>"Unsupported .. "</i> kind of errors -- the proper solution is to run <code>SPARQL LOAD SERVICE DATA</code>. If however the error persists, one should rephrase the query as the remote can't handle the query in its current form. ---++Related * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]] * [[VirtTipsAndTricksDiscoverSPARQFedCapabilitiesSPARQL][Adding SPARQL Endpoint Capabilities Interrogation to Virtuoso SPARQL-FED functionality]]

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