メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.6062500 43.6125000, 142.6125000 43.6125000, 142.6125000 43.6166667, 142.6062500 43.6166667, 142.6062500 43.6125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral