メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5562500 41.9291667, 140.5625000 41.9291667, 140.5625000 41.9333333, 140.5562500 41.9333333, 140.5562500 41.9291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral