メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1812500 33.9333333, 136.1875000 33.9333333, 136.1875000 33.9375000, 136.1812500 33.9375000, 136.1812500 33.9333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral