federated_query_works_based_on_viafURI_example.rq

# federated a query that looks at data from WorldCat, Wikidata and British Library. 
# Will take the author URI from a WorldCat Bib graph and query Wikidata and British library for works that have the same author

PREFIX schema: <http://schema.org/> 
PREFIX library: <http://purl.org/library/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX dct: <http://purl.org/dc/terms/>
 
SELECT ?work ?workLabel
FROM <http://www.worldcat.org/oclc/470488115> 
WHERE {  
<http://www.worldcat.org/oclc/470488115> schema:author ?creatorURI.
BIND(replace(STR(?creatorURI), "^(.*[\\/])*", "") AS ?creatorID)  
 
{SERVICE <https://query.wikidata.org/sparql> {
  ?author wdt:P214 ?creatorID.
  ?work wdt:P50 ?author .
  ?work wdt:P1476 ?workLabel
  } 
}  
UNION
{
SERVICE <http://bnb.data.bl.uk/sparql> {  
?bl_creator <http://www.w3.org/2002/07/owl#sameAs> ?creatorURI.
?work dct:creator ?bl_creator.
?work dct:title ?workLabel
 }
} 
}
LIMIT 10