メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907801172858 43.4809584893141, 141.90701887448 43.4810883337606, 141.907013681225 43.4810675372566, 141.906848731573 43.4804067658467, 141.906708388673 43.4799322532769, 141.907511643562 43.4798128109127, 141.907553004958 43.4799520011075, 141.907564850185 43.4799918755174, 141.907857335077 43.4809491976057, 141.907801172858 43.4809584893141)) ^^http://www.opengis.net/ont/geosparql#wktLiteral