メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9687500 38.5791667, 140.9750000 38.5791667, 140.9750000 38.5833333, 140.9687500 38.5833333, 140.9687500 38.5791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral