メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.5312500 27.3541667, 128.5375000 27.3541667, 128.5375000 27.3583333, 128.5312500 27.3583333, 128.5312500 27.3541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral