メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.326018639406 43.0615764763875, 141.326015572962 43.0615891112916, 141.325869754249 43.0622034528429, 141.324325096262 43.0619879877189, 141.324474575097 43.0613736781937, 141.324626799923 43.0607806301362, 141.326165142647 43.0609930848211, 141.326018639406 43.0615764763875)) ^^http://www.opengis.net/ont/geosparql#wktLiteral