メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397720781009 44.1844334633154, 142.397433122223 44.1843824684892, 142.39693355647 44.1842938963444, 142.397183153056 44.1834903190965, 142.397314064124 44.1830946913198, 142.39808229626 44.1832249991645, 142.397915397602 44.1838311827885, 142.397720781009 44.1844334633154)) ^^http://www.opengis.net/ont/geosparql#wktLiteral