メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3125000 38.2583333, 140.3187500 38.2583333, 140.3187500 38.2625000, 140.3125000 38.2625000, 140.3125000 38.2583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral