メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.773440987055 43.2090241811163, 141.774037510184 43.2093244999314, 141.77332061822 43.2100570839618, 141.773279886245 43.2100216797285, 141.773204347533 43.2098625645197, 141.772990327082 43.2097691214281, 141.772314203841 43.2094183917701, 141.772897557374 43.2087655734446, 141.773440987055 43.2090241811163)) ^^http://www.opengis.net/ont/geosparql#wktLiteral