query.indexpatternendpoint.rq Maven / Gradle / Ivy

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#
# Federated Query pattern for LOD graph index
# Perform source selection
# Pattern completed by FederatedVisitor SelectorIndex
# Return endpoint URI -> predicate: true|false
#
prefix dqv:     
prefix kgi:     
prefix void:    
prefix dcterms: 

select distinct ?serv ?c 
where {
service  {
graph ?g {
    ?metadata dcterms:modified ?modif .
    ?metadata kgi:curated ?s .
    ?metadata dqv:hasQualityMeasurement ?qualityMeasure .
    ?s void:sparqlEndpoint  ?serv

   # optional {?s void:propertyPartition/void:property <$predicate>} 
   %s
}   
# get latest metadata
filter not exists {
    ?m kgi:curated/void:sparqlEndpoint ?serv
    ?m dcterms:modified ?modif0 
    filter (?modif0 < ?modif) 
}

}}
order by desc(?c) ?serv