メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.895684692627 43.0097209745287, 142.895680785893 43.0097185344135, 142.895578353442 43.0096556732442, 142.894878542461 43.0092262377776, 142.895824578659 43.0083783589582, 142.896556652585 43.0088280027937, 142.896648716531 43.008884522016, 142.896020447768 43.0094333320718, 142.895684692627 43.0097209745287)) ^^http://www.opengis.net/ont/geosparql#wktLiteral