メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.107531560021 43.8245224449425, 144.106540712679 43.8248119146637, 144.10651029734 43.8247582453991, 144.105833572787 43.8235883359666, 144.10646374217 43.8234574201991, 144.106878802251 43.8234431274197, 144.10749286636 43.8244585919842, 144.107531560021 43.8245224449425)) ^^http://www.opengis.net/ont/geosparql#wktLiteral