メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6375000 33.1791667, 130.6437500 33.1791667, 130.6437500 33.1833333, 130.6375000 33.1833333, 130.6375000 33.1791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral