CiTO nanopublications

citoPubs.rq

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 xsd: <http://www.w3.org/2001/XMLSchema#>
prefix dct: <http://purl.org/dc/terms/>

select ?np ?label ?subj ?citationrel ?obj ?date where {
  graph npa:graph {
    ?np npa:hasValidSignatureForPublicKey ?pubkey .
    ?np dct:created ?date .
    ?np np:hasAssertion ?assertion .
    optional { ?np rdfs:label ?label . }
    filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?pubkey . }
    filter not exists { ?np npx:hasNanopubType npx:ExampleNanopub . }
  }
  graph ?assertion {
    ?subj ?citationrel ?obj .
    filter(regex(str(?citationrel), "^http://purl.org/spar/cito/.*$"))
    filter(regex(str(?subj), "doi.org/10"))
    filter(regex(str(?obj), "doi.org/10"))
  }
}