メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5687500 34.8458334, 136.5750000 34.8458334, 136.5750000 34.8500000, 136.5687500 34.8500000, 136.5687500 34.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral