メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4437500 42.1333333, 140.4500000 42.1333333, 140.4500000 42.1375000, 140.4437500 42.1375000, 140.4437500 42.1333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral