メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7687500 33.0958334, 129.7750000 33.0958334, 129.7750000 33.1000000, 129.7687500 33.1000000, 129.7687500 33.0958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral