メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421462702334 43.7674207232055, 142.420866695276 43.7674566248898, 142.42085006318 43.7672737235141, 142.420731795239 43.766295066114, 142.42135728356 43.7662493808143, 142.42193717032 43.7662135008546, 142.422036676149 43.7671941368425, 142.422047984252 43.7673926046836, 142.421462702334 43.7674207232055)) ^^http://www.opengis.net/ont/geosparql#wktLiteral