human
Find the earliest construction year among roads.
gpt
```sparql
PREFIX :    <http://example.org/ontology#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT (MIN(?year) AS ?earliest)
WHERE {
  ?road rdf:type :Road ;
        :hasConstructionYear ?year .
}
```