メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.323057135588 43.2315087811755, 144.32082689938 43.2320519939326, 144.320798732713 43.2319871023689, 144.319765463561 43.2296029576089, 144.319908031663 43.2295699274047, 144.321952957386 43.229072281321, 144.323034216965 43.2314512491423, 144.323057135588 43.2315087811755)) ^^http://www.opengis.net/ont/geosparql#wktLiteral