メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396182558548 44.1735072676324, 142.394843263483 44.1732958678603, 142.395118346333 44.1722649077134, 142.396452606225 44.1724839211185, 142.396447754766 44.172502263192, 142.396182558548 44.1735072676324)) ^^http://www.opengis.net/ont/geosparql#wktLiteral