メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.918636821558 43.4818628441744, 141.91862416808 43.4818324268468, 141.918519421753 43.4814779981164, 141.918409036618 43.4811043551488, 141.918391319529 43.4810684024167, 141.920294926378 43.480775401347, 141.921530326908 43.4805880507148, 141.92179935884 43.4805496840148, 141.922072951433 43.4813726832008, 141.920393415819 43.4816131967957, 141.91945889189 43.4817506953757, 141.918636821558 43.4818628441744)) ^^http://www.opengis.net/ont/geosparql#wktLiteral