メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7250000 41.8333333, 140.7312500 41.8333333, 140.7312500 41.8375000, 140.7250000 41.8375000, 140.7250000 41.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral