メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8375000 33.5833333, 129.8437500 33.5833333, 129.8437500 33.5875000, 129.8375000 33.5875000, 129.8375000 33.5833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral