メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.293469045259 43.1212106007642, 141.291857748985 43.1221286471867, 141.290884000689 43.1212039665418, 141.292511830638 43.1203208151168, 141.293469045259 43.1212106007642)) ^^http://www.opengis.net/ont/geosparql#wktLiteral