问题
I am writing a SPARQL query that should delete all triples within in this resource.
prefix oslc: <http://open-services.net/ns/core#>
prefix example: <http://rdf.company.com/ns/something/net#>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>
prefix dcterms: <http://purl.org/dc/terms/>
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
example:Resource2
a oslc:ResourceShape ;
oslc:describes example:Resource2 ;
oslc:property [ a oslc:Property ;
oslc:isMemberProperty true ;
oslc:name "pgn" ;
oslc:occurs oslc:Zero-or-one ;
oslc:valueType xsd:integer ] ;
dcterms:title "Resource2"^^rdf:XMLLiteral .
I have tried:
DELETE
{ ?s ?p ?o }
WHERE
{
?s ?p ?o .
FILTER ( ?s IN ( <http://rdf.company.com/ns/something/net#Resource2>))
}
However, id does not delete the blank node within it:
[ a oslc:Property ;
oslc:isMemberProperty true ;
oslc:name "pgn" ;
oslc:occurs oslc:Zero-or-one ;
oslc:valueType xsd:integer ]
It is pretty obvious because the filter specifies a specific subject and the blank node does not have that subject.
Any idea how can I delete the blank node as well?
回答1:
I hope you do not have nested blank nodes. Try this:
PREFIX example: <http://rdf.company.com/ns/something/net#>
DELETE {
?s ?p ?o .
?o ?p1 ?o1 .
}
WHERE {
VALUES (?s) { (example:Resource2) }
?s ?p ?o .
OPTIONAL {
?o ?p1 ?o1 .
FILTER (isBlank(?o))
}
}
Related question: Delete blank node from ontology through SPARQL UPDATE.
来源:https://stackoverflow.com/questions/46526033/sparql-query-to-delete-all-blank-nodes-with-in-a-resource