About: VirtTipsAndTricksDiscoverSPARQFedCapabilities

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Date Created	2017-06-13 05:47:20.917900 (xsd:dateTime)
Date Modified	2017-06-13 05:47:20.917900 (xsd:dateTime)
label	VirtTipsAndTricksDiscoverSPARQFedCapabilities
maker	WebDAV System Administrator owiki
Title	VirtTipsAndTricksDiscoverSPARQFedCapabilities
isDescribedUsing	http://vos.openlinksw.com/dataspace/owiki/wiki/VOS/VirtTipsAndTricksDiscoverSPARQFedCapabilities/sioc.rdf
has creator	http://vos.openlinksw.com/dataspace/dav#this http://vos.openlinksw.com/dataspace/owiki#this
content	%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: SPARQL LOAD SERVICE DATA ---+++Example 1 Load [[http://lod.openlinksw.com][LOD]] SPARQL Endpoint data: SPARQL LOAD SERVICE DATA Query result: ANY Load service data -- done. Trying to query as SPARQL web service endpoint, POST mode... 2 Check the loaded data: SPARQL SELECT * FROM virtrdf: WHERE { ?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 ---++Additional Usage Benefits Suppose one queries a remote endpoint and get sort of "Unsupported .. " kind of errors -- the proper solution is to run `SPARQL LOAD SERVICE DATA`. 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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link	VirtTipsAndTricksDiscoverSPARQFedCapabilities
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atom:title	VirtTipsAndTricksDiscoverSPARQFedCapabilities
links to	VirtTipsAndTricksDiscoverSPARQFedCapabilitiesSPARQL http://lod.openlinksw.com
atom:source	owiki's Wiki
atom:author	WebDAV System Administrator
atom:published	2017-06-13T05:47:20Z
atom:updated	2017-06-13T05:47:20Z
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