メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3625000 36.2083333, 140.3687500 36.2083333, 140.3687500 36.2125000, 140.3625000 36.2125000, 140.3625000 36.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral