メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.6000000 42.9625000, 141.6062500 42.9625000, 141.6062500 42.9666667, 141.6000000 42.9666667, 141.6000000 42.9625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral