メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7625000 38.1583333, 140.7687500 38.1583333, 140.7687500 38.1625000, 140.7625000 38.1625000, 140.7625000 38.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral