メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.132253943324 39.6821143896651, 140.132245613683 39.6825378951392, 140.131766053442 39.6823991825689, 140.131857123534 39.6822056178419, 140.132131660927 39.6821384568752, 140.132253943324 39.6821143896651)) ^^http://www.opengis.net/ont/geosparql#wktLiteral