Input: references

As we want to restrict input, we cannot pass extra information from references along with stated in. This means missing out on reference URL, retrieved, and identifiers. The tool can instead take reference URIs as input and retrieve that information itself.

SELECT ?ref ?statedIn ?formatterUrl ?identifier ?referenceUrl ?retrieved WHERE {
  VALUES ?ref { wdref:005bca173b32a7c8f623bbeb832a152889e8f4e3 }
  OPTIONAL {
    ?ref pr:P248 ?statedIn .
    OPTIONAL {
      ?statedIn ^wdt:P9073 ?identifierProperty .
      ?identifierProperty wikibase:reference ?identifierPropertyReference .
      OPTIONAL {
        ?identifierProperty wdt:P1630 ?formatterUrl .
      }
      ?ref ?identifierPropertyReference ?identifier .
    }
  }
  OPTIONAL {
    ?ref pr:P854 ?referenceUrl .
  }
  OPTIONAL {
    ?ref pr:P813 ?retrieved .
  }
}

Start by locating the tool's input handling and the code path that processes the supplied reference URIs, then compare its behavior with the SPARQL query in the issue. Done means reference URIs can be accepted and the available stated-in, identifier, reference URL, and retrieved information is returned.