メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.351470783048 43.0692782856084, 141.349968960356 43.0690672318614, 141.350240312032 43.0679936061358, 141.351715662125 43.0682224527507, 141.351470783048 43.0692782856084)) ^^http://www.opengis.net/ont/geosparql#wktLiteral