メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.349548917659 43.0641578035429, 141.347981948745 43.0639569722746, 141.34828934763 43.0627740618218, 141.349833435399 43.0629830066936, 141.349548917659 43.0641578035429)) ^^http://www.opengis.net/ont/geosparql#wktLiteral