メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.8937500 43.4333333, 144.9000000 43.4333333, 144.9000000 43.4375000, 144.8937500 43.4375000, 144.8937500 43.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral