メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1500000 26.7083333, 128.1562500 26.7083333, 128.1562500 26.7125000, 128.1500000 26.7125000, 128.1500000 26.7083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral