メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763244571809 43.1889237954375, 141.763700782309 43.1891592237253, 141.763056338456 43.1898438671019, 141.762588528314 43.1895981174565, 141.762147907383 43.1893724562484, 141.762774352076 43.1886918208258, 141.762797708471 43.1887037354099, 141.763216668214 43.1889094004573, 141.763244571809 43.1889237954375)) ^^http://www.opengis.net/ont/geosparql#wktLiteral