メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.896252104591 43.0184560324708, 142.895943568109 43.018729523519, 142.895564087942 43.0190795804375, 142.89502224918 43.0187581270546, 142.895131030124 43.0186660163109, 142.895755934469 43.0181342559178, 142.896252104591 43.0184560324708)) ^^http://www.opengis.net/ont/geosparql#wktLiteral