メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6625000 41.9083333, 140.6687500 41.9083333, 140.6687500 41.9125000, 140.6625000 41.9125000, 140.6625000 41.9083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral