sub:assertion {
  sub:get-approved-nanopubs dct:description "This query returns all nanopublications approved by somebody (\"creator\")." ;
    dct:license <http://www.apache.org/licenses/LICENSE-2.0> ;
    a <https://w3id.org/kpxl/grlc/grlc-query> ;
    rdfs:label "Get approved nanopubs" ;
    <https://w3id.org/kpxl/grlc/endpoint> <https://query.np.trustyuri.net/repo/type/4a9a4dc2fa939033dd444d4f630fec3450eee305d98dd9945f110b2a6bb51317> ;
    <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/>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

select ?creator ?approved_np ?np ?date where {
  graph npa:graph {
    ?np npa:hasValidSignatureForPublicKey ?pubkey .
    filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?pubkey . }
    ?np npx:hasNanopubType npx:approvesOf .
    filter not exists { ?np npx:hasNanopubType npx:ExampleNanopub . }
    ?np dct:created ?date .
    ?np dct:creator ?creator .
    ?np np:hasAssertion ?a .
  }
  graph ?a {
    ?creator npx:approvesOf ?approved_np .
    filter(regex(str(?approved_np), '^.*[^A-Za-z0-9-_]RA[A-Za-z0-9-_]{43}$'))
  }
}""" .
}