メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.2125000 26.7750000, 128.2187500 26.7750000, 128.2187500 26.7791667, 128.2125000 26.7791667, 128.2125000 26.7750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral