メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.523626276126 43.8524893568216, 141.523381401395 43.8530134178646, 141.519472142461 43.852092817791, 141.519747202725 43.8515742707614, 141.519765849096 43.8515391587108, 141.523626276126 43.8524893568216)) ^^http://www.opengis.net/ont/geosparql#wktLiteral