メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6812500 35.8583333, 140.6875000 35.8583333, 140.6875000 35.8625000, 140.6812500 35.8625000, 140.6812500 35.8583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral