メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904305089785 43.4850812971475, 141.903713888365 43.4851700615943, 141.903477799498 43.4844058692349, 141.903459546568 43.4843468125702, 141.904061165397 43.4842467226746, 141.904305089785 43.4850812971475)) ^^http://www.opengis.net/ont/geosparql#wktLiteral