メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.364066654913 43.0768883511276, 141.363018786203 43.076743235935, 141.363317036172 43.0756008636398, 141.364346953931 43.0757388041905, 141.364066654913 43.0768883511276)) ^^http://www.opengis.net/ont/geosparql#wktLiteral