sub:assertion {
  sub:find-referencing-nanopubs dct:description "This query returns the nanopublications that reference the given URI in subject, predicate, or object position." ;
    dct:license <http://www.apache.org/licenses/LICENSE-2.0> ;
    a <https://w3id.org/kpxl/grlc/grlc-query> ;
    rdfs:label "Find referencing nanopubs" ;
    <https://w3id.org/kpxl/grlc/endpoint> <https://w3id.org/np/l/nanopub-query-1.1/repo/full> ;
    <https://w3id.org/kpxl/grlc/sparql> """prefix np: <http://www.nanopub.org/nschema#>
prefix npa: <http://purl.org/nanopub/admin/>
prefix npx: <http://purl.org/nanopub/x/>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>
prefix dct: <http://purl.org/dc/terms/>

select distinct ?np ?date ?pubkey where {
  graph npa:graph {
    ?np npa:hasValidSignatureForPublicKey ?pubkey .
    filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?pubkey . }
    ?np dct:created ?date .
  }
    graph npa:graph {
      ?np npa:hasGraph ?g .
    }
    graph ?g {
      { { ?_ref_iri ?pred ?obj . } union { ?subj ?_ref_iri ?obj . } union { ?subj ?pred ?_ref_iri . } }
    }
} limit 1000""" .
}