メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6937500 27.4333333, 128.7000000 27.4333333, 128.7000000 27.4375000, 128.6937500 27.4375000, 128.6937500 27.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral