メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((133.6937500 34.5708334, 133.7000000 34.5708334, 133.7000000 34.5750000, 133.6937500 34.5750000, 133.6937500 34.5708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral