メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.417018057182 43.8327275147345, 142.415338721157 43.8315389652417, 142.417828166988 43.8297529359735, 142.418095346235 43.8299402318763, 142.419509247702 43.8309650048945, 142.417018057182 43.8327275147345)) ^^http://www.opengis.net/ont/geosparql#wktLiteral