メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.781212622272 43.2129428099489, 141.782146414026 43.213433091014, 141.781411177625 43.2142174172829, 141.780458634377 43.2137328893924, 141.779528422495 43.2132596296363, 141.780275988638 43.2124739599403, 141.781212622272 43.2129428099489)) ^^http://www.opengis.net/ont/geosparql#wktLiteral