human
Find buildings that have geometry but no construction year.
gpt
```sparql
PREFIX :    <http://example.org/ontology#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?building
WHERE {
  ?building rdf:type :Building ;
            :hasGeometry ?geom .
  FILTER NOT EXISTS {
    ?building :hasConstructionYear ?year .
  }
}
```