メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.342854770321 43.7703330992146, 142.343187353236 43.7708999669104, 142.342175146736 43.7711922317909, 142.341865796233 43.7706150744614, 142.341530263521 43.7700248938929, 142.342914521529 43.7696310300216, 142.343237735979 43.7702238188498, 142.342854770321 43.7703330992146)) ^^http://www.opengis.net/ont/geosparql#wktLiteral