メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1500000 26.6875000, 128.1562500 26.6875000, 128.1562500 26.6916667, 128.1500000 26.6916667, 128.1500000 26.6875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral