メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.1625000 34.6083333, 137.1687500 34.6083333, 137.1687500 34.6125000, 137.1625000 34.6125000, 137.1625000 34.6083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral