メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.915736120763 43.4963497087579, 141.913967752283 43.4966622899827, 141.9136771742 43.4956360732178, 141.914618592589 43.4954846856471, 141.915441629098 43.4953538664323, 141.91569416188 43.496207842663, 141.915736120763 43.4963497087579)) ^^http://www.opengis.net/ont/geosparql#wktLiteral