メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8437500 35.5708334, 135.8500000 35.5708334, 135.8500000 35.5750000, 135.8437500 35.5750000, 135.8437500 35.5708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral