メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.523905146231 43.851902174513, 141.523626276126 43.8524893568216, 141.519765849096 43.8515391587108, 141.520025589586 43.8509375865644, 141.523905146231 43.851902174513)) ^^http://www.opengis.net/ont/geosparql#wktLiteral