メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.3375000 33.6875000, 135.3437500 33.6875000, 135.3437500 33.6916667, 135.3375000 33.6916667, 135.3375000 33.6875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral