メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.264724403426 44.0205656578906, 144.263148837011 44.020413519869, 144.263250920331 44.019842670766, 144.264829367117 44.0200055340897, 144.264724403426 44.0205656578906)) ^^http://www.opengis.net/ont/geosparql#wktLiteral