メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8437500 34.3458334, 135.8500000 34.3458334, 135.8500000 34.3500000, 135.8437500 34.3500000, 135.8437500 34.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral