1.5.75. How to discover the capabilities of a SPARQL endpoint to enhancing SPARQL-FED usage from Virtuoso instances?

What?

How to discover the capabilities of a SPARQL endpoint en route to enhancing SPARQL-FED usage from Virtuoso instances.

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 <{sparql-endpoint-iri> DATA

Example

Run:

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...

Check the retrieved data:

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

Prefix	IRI
schema	http://schema.org/
n4	http://creativecommons.org/licenses/by/4.0/
rdf	http://www.w3.org/1999/02/22-rdf-syntax-ns#
n3	http://docs.openlinksw.com/virtuoso/discoversparqlfedcapabtip/
n5	http://www.openlinksw.com/#
xsdh	http://www.w3.org/2001/XMLSchema#

Prefix	URI
xmlns:schema	http://schema.org/
xmlns:n4	http://creativecommons.org/licenses/by/4.0/
xmlns:rdf	http://www.w3.org/1999/02/22-rdf-syntax-ns#
xmlns:n3	http://docs.openlinksw.com/virtuoso/discoversparqlfedcapabtip/
xmlns:n5	http://www.openlinksw.com/#
xmlns:xsdh	http://www.w3.org/2001/XMLSchema#

Prefix

URI

xmlns:schema

http://schema.org/

xmlns:n4

http://creativecommons.org/licenses/by/4.0/

xmlns:rdf

http://www.w3.org/1999/02/22-rdf-syntax-ns#

xmlns:n3

http://docs.openlinksw.com/virtuoso/discoversparqlfedcapabtip/

xmlns:n5

http://www.openlinksw.com/#

xmlns:xsdh

http://www.w3.org/2001/XMLSchema#

Subject	Predicate	Object
n3:	rdf:type	schema:TechArticle
n3:	schema:name	1.5.75.ÃÂ How to discover the capabilities of a SPARQL endpoint to enhancing SPARQL-FED usage from Virtuoso instances?
n3:	schema:copyrightHolder	_:vb78910
n3:	schema:datePublished	2016-09-09 16:16:54
n3:	schema:headline	1.5.75.ÃÂ How to discover the capabilities of a SPARQL endpoint to enhancing SPARQL-FED usage from Virtuoso instances?
n3:	schema:keywords	OpenLink,Virtuoso,database,RDBMS,relational,SQL,RDF,triple store,linked data,linked open data,Big Data,SPARQL
n3:	schema:license	n4:deed.en_US
n3:	schema:publisher	_:vb78909
n3:	schema:url	n3:
_:vb78909	rdf:type	schema:Organization
_:vb78909	schema:name	OpenLink Software
_:vb78909	schema:url	n5:this
_:vb78910	rdf:type	schema:Organization
_:vb78910	schema:name	OpenLink Software
_:vb78910	schema:url	n5:this

Subject

Predicate

Object

n3:

rdf:type

schema:TechArticle

n3:

schema:name

1.5.75.ÃÂ How to discover the capabilities of a SPARQL endpoint to enhancing SPARQL-FED usage from Virtuoso instances?

n3:

schema:copyrightHolder

_:vb78910

n3:

schema:datePublished

2016-09-09 16:16:54

n3:

schema:headline

1.5.75.ÃÂ How to discover the capabilities of a SPARQL endpoint to enhancing SPARQL-FED usage from Virtuoso instances?

n3:

schema:keywords

OpenLink,Virtuoso,database,RDBMS,relational,SQL,RDF,triple store,linked data,linked open data,Big Data,SPARQL

n3:

schema:license

n4:deed.en_US

n3:

schema:publisher

_:vb78909

n3:

schema:url

n3:

_:vb78909

rdf:type

schema:Organization

_:vb78909

schema:name

OpenLink Software

_:vb78909

schema:url

n5:this

_:vb78910

rdf:type

schema:Organization

_:vb78910

schema:name

OpenLink Software

_:vb78910

schema:url

n5:this

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