メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8375000 34.3875000, 135.8437500 34.3875000, 135.8437500 34.3916667, 135.8375000 34.3916667, 135.8375000 34.3875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral