メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3500000 43.0083333, 141.3562500 43.0083333, 141.3562500 43.0125000, 141.3500000 43.0125000, 141.3500000 43.0083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral