sub:assertion {
  sub:get-participation dct:description "This query returns all participation links." ;
    dct:license <http://www.apache.org/licenses/LICENSE-2.0> ;
    a <https://w3id.org/kpxl/grlc/grlc-query> ;
    rdfs:label "Get participation links" ;
    <https://w3id.org/kpxl/grlc/endpoint> <https://w3id.org/np/l/nanopub-query-1.1/repo/full> ;
    <https://w3id.org/kpxl/grlc/sparql> """prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix dct: <http://purl.org/dc/terms/>
prefix np: <http://www.nanopub.org/nschema#>
prefix npa: <http://purl.org/nanopub/admin/>
prefix npx: <http://purl.org/nanopub/x/>

select ?subj ?obj ?np ?date where {
graph npa:graph {
   ?np npa:hasValidSignatureForPublicKey ?pubkey .
   filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?pubkey . }
   ?np dct:created ?date .
   ?np np:hasAssertion ?a .
   optional { ?np rdfs:label ?label }
}
graph ?a {
  ?subj <http://www.wikidata.org/entity/P1344> ?obj .
}
}""" .
}