メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0500000 26.6166667, 128.0562500 26.6166667, 128.0562500 26.6208334, 128.0500000 26.6208334, 128.0500000 26.6166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral