%META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---++How to handle SPARQL-FED queries for SPARQL endpoints with no OPTION() clause supported? Suppose the following sample scenario: 1. Assume the following SPARQL-FED query: PREFIX wp: PREFIX atlasterms: PREFIX efo: SELECT DISTINCT ?wpTitle ?dbXref ?expressionValue WHERE { { GRAPH { ?pwElement dcterms:isPartOf ?wpPathway . ?wpPathway dc:identifier . ?wpPathway dc:title ?wpTitle . ?pwElement wp:bdbEnsembl ?dbXref . } SERVICE { ?value atlasterms:hasFactorValue ?factor . ?value atlasterms:isMeasurementOf ?probe . ?value atlasterms:pValue ?pvalue . ?value rdfs:label ?expressionValue . ?probe atlasterms:dbXref ?dbXref . ?disFactor rdfs:subClassOf+ efo:EFO_0000408 . ?disease rdf:type ?disFactor . ?disFactor rdfs:label ?label . } } } 1. Execute the query from Virtuoso sparql endpoint 1. As result you should get the following error: Virtuoso 37000 Error SP031: SPARQL compiler: SERVICE at line 18 does not support OPTION (...) clause for triples so SPARQL query can not be composed The error message means that the https://www.ebi.ac.uk/fgpt/atlasrdf/sparql sparql endpoint does not support OPTION clause. Basically, one should be able to use the following command to interrogate a target SPARQL endpoint (if initial SPARQL-FED fails): SPARQL LOAD SERVICE <{SPARQL-END-POINT-URL}> DATA So in our example it would be: LOAD SERVICE DATA ; ---+++Related * [[VirtTipsAndTricksDiscoverSPARQFedCapabilities][How to discover the capabilities of a SPARQL endpoint en route to enhancing SPARQL-FED usage from Virtuoso instances?]]