sub:assertion {
  sub:get-instances-simple dct:description "This query returns the instances assigned to the given class." ;
    dct:license <http://www.apache.org/licenses/LICENSE-2.0> ;
    a <https://w3id.org/kpxl/grlc/grlc-query> ;
    rdfs:label "Get instances for class (simple result)" ;
    <https://w3id.org/kpxl/grlc/endpoint> <https://w3id.org/np/l/nanopub-query-1.1/repo/full> ;
    <https://w3id.org/kpxl/grlc/sparql> """prefix dct: <http://purl.org/dc/terms/>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix np: <http://www.nanopub.org/nschema#>
prefix npa: <http://purl.org/nanopub/admin/>
prefix npx: <http://purl.org/nanopub/x/>
prefix nt: <https://w3id.org/np/o/ntemplate/>

select ?instance ?instance_label ?date ?creator ?np where {
  graph ?g {
    ?instance a ?_class_iri .
  }
  graph npa:graph {
    ?np npa:hasValidSignatureForPublicKey ?pubkey .
    filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?pubkey . }
    ?np npa:hasGraph ?g .
    ?np np:hasPublicationInfo ?i .
    ?np dct:created ?date .
    optional { ?np npx:signedBy ?creator }
  }
  optional { graph ?g {  ?instance rdfs:label ?instanceLabel1 . } }
  optional { graph ?g {  ?instance dct:title ?instanceLabel2 . } }
  optional { graph ?i {  ?instance rdfs:label ?instanceLabel3 . } }
  optional { graph ?i {  ?instance nt:hasLabelFromApi ?instanceLabel4 . } }
  bind(coalesce(?instanceLabel1, ?instanceLabel2, ?instanceLabel3, ?instanceLabel4) as ?instance_label)
}""" .
}