メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.654176657488 42.8197440395295, 141.65558793913 42.8202957610144, 141.654278401568 42.8214652719541, 141.65337977204 42.8208798466073, 141.653278005251 42.8208168599186, 141.65258156101 42.8203948835192, 141.653396340872 42.8194456985343, 141.654176657488 42.8197440395295)) ^^http://www.opengis.net/ont/geosparql#wktLiteral