メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9687500 34.5041667, 135.9750000 34.5041667, 135.9750000 34.5083333, 135.9687500 34.5083333, 135.9687500 34.5041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral