メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.1562500 26.6375000, 142.1625000 26.6375000, 142.1625000 26.6416667, 142.1562500 26.6416667, 142.1562500 26.6375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral