メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.9312500 43.4291667, 144.9375000 43.4291667, 144.9375000 43.4333333, 144.9312500 43.4333333, 144.9312500 43.4291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral