メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3125000 35.5541667, 140.3187500 35.5541667, 140.3187500 35.5583333, 140.3125000 35.5583333, 140.3125000 35.5541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral