メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5625000 34.2833333, 135.5687500 34.2833333, 135.5687500 34.2875000, 135.5625000 34.2875000, 135.5625000 34.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral