メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1250000 39.5833333, 140.1312500 39.5833333, 140.1312500 39.5875000, 140.1250000 39.5875000, 140.1250000 39.5833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral