メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.0125000 42.9583333, 142.0187500 42.9583333, 142.0187500 42.9625000, 142.0125000 42.9625000, 142.0125000 42.9583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral