メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.387245916898 42.9887475519308, 144.38568812603 42.9884881160233, 144.385874660314 42.9879056865427, 144.387430090206 42.9881692423358, 144.387245916898 42.9887475519308)) ^^http://www.opengis.net/ont/geosparql#wktLiteral