メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.860597575789 43.3303947940458, 141.860804461001 43.3311127002954, 141.86013390686 43.3312131035116, 141.859916179477 43.3304932596633, 141.859777190618 43.3300244019301, 141.860450661526 43.3299252774685, 141.860597575789 43.3303947940458)) ^^http://www.opengis.net/ont/geosparql#wktLiteral