メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9187500 41.4666667, 140.9250000 41.4666667, 140.9250000 41.4708334, 140.9187500 41.4708334, 140.9187500 41.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral