メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.888969829208 43.0157322418021, 142.887909192904 43.0150803538267, 142.888395070766 43.0146560952982, 142.88887624136 43.0142266574917, 142.889947256613 43.0148771426736, 142.888969829208 43.0157322418021)) ^^http://www.opengis.net/ont/geosparql#wktLiteral