メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.430603085747 43.0808027361648, 141.429558850815 43.0804635132454, 141.429857391172 43.0799696916183, 141.429522540928 43.0797835917597, 141.428893083144 43.0790707229276, 141.430123199348 43.0782029562683, 141.431792767959 43.0795422960799, 141.431206194263 43.0798943194419, 141.430603085747 43.0808027361648)) ^^http://www.opengis.net/ont/geosparql#wktLiteral