Join semantic endpoints in SPARQL query

Question

I'm trying to make a request which uses both bibleontology and dbpedia semantic databases:

PREFIX bibleontology: <http://bibleontology.com/resource/>
PREFIX dbo: <http://dbpedia.org/ontology/>

SELECT ?art ?abstract WHERE { 
bibleontology:Ezra owl:sameAs ?art .
?art dbo:abstract ?abstract .
}

This kind of request works on neither the bibleontology SPARQL endpoint, nor on the dbpedia SPARQL endpoint. Individual parts of the requests work fine on the each SPARQL endpoints.

Is it possible to join databases this way?

Answer 1

I'm Engineer for bibleontology.com

bibleontology.com adopted SPARQL1.1

PREFIX bibleontology: <http://bibleontology.com/resource/>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
SELECT ?art ?abstract
WHERE {
SERVICE <http://bibleontology.com/sparql/> { bibleontology:Ezra owl:sameAs ?art . }
SERVICE <http://dbpedia.org/sparql> { ?art dbo:abstract ?abstract . } }