メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8875000 34.9333333, 135.8937500 34.9333333, 135.8937500 34.9375000, 135.8875000 34.9375000, 135.8875000 34.9333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral