メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.889040304396 43.0201858781763, 142.888284647522 43.0197486992642, 142.889285424178 43.0188557124523, 142.890037028112 43.0193274408875, 142.889040304396 43.0201858781763)) ^^http://www.opengis.net/ont/geosparql#wktLiteral