メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1625000 39.7000000, 141.1687500 39.7000000, 141.1687500 39.7041667, 141.1625000 39.7041667, 141.1625000 39.7000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral