メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0062500 33.7208334, 131.0125000 33.7208334, 131.0125000 33.7250000, 131.0062500 33.7250000, 131.0062500 33.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral