human
327) Count buildings that have geometry referencing 'ArcString' in WKT (another extension).
gpt
```sparql
PREFIX geo:<http://www.opengis.net/ont/geosparql#>
PREFIX :   <http://example.org/ontology#>

SELECT (COUNT(?b) AS ?count)
WHERE {
  ?b a :Building ;
     :hasGeometry ?g .
  ?g geo:asWKT ?wkt .
  FILTER regex(?wkt, "ARCSTRING", "i")
}
```