メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.351715662125 43.0682224527507, 141.350240312032 43.0679936061358, 141.350524210365 43.0667632438152, 141.352068674633 43.0669538774284, 141.351715662125 43.0682224527507)) ^^http://www.opengis.net/ont/geosparql#wktLiteral