メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6062500 33.0375000, 129.6125000 33.0375000, 129.6125000 33.0416667, 129.6062500 33.0416667, 129.6062500 33.0375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral