メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.64764990631 43.9364973191618, 141.648447068328 43.9370811746583, 141.647967704349 43.9374146672015, 141.6479520734 43.9374255277006, 141.647408614038 43.9378321092657, 141.646588547047 43.9372230307277, 141.645427606669 43.9363794503752, 141.646002985952 43.9359873356484, 141.646487377169 43.9356572428413, 141.64764990631 43.9364973191618)) ^^http://www.opengis.net/ont/geosparql#wktLiteral