メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8625000 34.6333333, 135.8687500 34.6333333, 135.8687500 34.6375000, 135.8625000 34.6375000, 135.8625000 34.6333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral