sub:assertion {
  sub:get-dggs-nanopubs dct:description "List nanopublications related to Discrete Global Grid Systems (DGGS)." ;
    dct:license <http://www.apache.org/licenses/LICENSE-2.0> ;
    a <https://w3id.org/kpxl/grlc/grlc-query> ;
    rdfs:label "Get nanopublications related to DGGS" ;
    <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 distinct ?np ?pubkey ?date ?label ?title ?text
       ?supersedes ?supersedes_count where {
  graph npa:graph {
    ?np npa:hasValidSignatureForPublicKeyHash ?pubkey .
   
    # Valid signature and not invalidated
    filter not exists {
      ?npx npx:invalidates ?np ;
           npa:hasValidSignatureForPublicKeyHash ?pubkey_inv .
    }
   
    # This is the LATEST version (nothing supersedes it)
    filter not exists {
      ?newer_np npx:supersedes ?np ;
                npa:hasValidSignatureForPublicKeyHash ?pubkey_super .
    }
   
    # Not retracted
    filter not exists {
      ?retraction_np npx:retracts ?np ;
                     npa:hasValidSignatureForPublicKeyHash ?pubkey_ret .
    }
   
    ?np dct:created ?date .
    ?np np:hasAssertion ?a .
  }
 
  # Check if this nanopub supersedes others (to show version history)
  optional {
    graph npa:graph {
      ?np npx:supersedes ?supersedes .
    }
  }
 
  graph ?a {
    ?s ?p ?o .
    filter(
      isLiteral(?o) && regex(str(?o), \"DGGS|Discrete Global Grid|discrete global grid\", \"i\")
    )
  }
 
  optional {
    graph ?a { ?s rdfs:label ?label }
  }
  optional {
    graph ?a { ?s dct:title ?title }
  }
  bind(?o as ?text)
}
order by desc(?date)""" .
}