メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.266299974537 44.0207177685335, 144.266280813272 44.0207159182964, 144.264724403426 44.0205656578906, 144.264829367117 44.0200055340897, 144.266413266862 44.0201679892132, 144.266299974537 44.0207177685335)) ^^http://www.opengis.net/ont/geosparql#wktLiteral