メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.417990228304 43.7399149242494, 142.418052534931 43.7404061111068, 142.41593423039 43.7405421589762, 142.414059765788 43.7406458618781, 142.413999398187 43.7401560048313, 142.413942310434 43.7396685337235, 142.415844543607 43.7395564256897, 142.417938728764 43.7394418983413, 142.417990228304 43.7399149242494)) ^^http://www.opengis.net/ont/geosparql#wktLiteral