メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.7937500 34.1666667, 131.8000000 34.1666667, 131.8000000 34.1708334, 131.7937500 34.1708334, 131.7937500 34.1666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral