メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5500000 36.9166667, 140.5562500 36.9166667, 140.5562500 36.9208334, 140.5500000 36.9208334, 140.5500000 36.9166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral