メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.888284647522 43.0197486992642, 142.887158140774 43.0190685477081, 142.888168733457 43.0181924642947, 142.888234126862 43.0182318360861, 142.889048581603 43.0187490769962, 142.889285424178 43.0188557124523, 142.888284647522 43.0197486992642)) ^^http://www.opengis.net/ont/geosparql#wktLiteral