メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.355774624376 43.7894637745972, 142.355764612443 43.7894710101555, 142.3541445548 43.7882851490257, 142.355506200279 43.7872942764437, 142.355518130275 43.7873027391378, 142.356786602618 43.7882121229253, 142.35715463231 43.7884679426321, 142.355774624376 43.7894637745972)) ^^http://www.opengis.net/ont/geosparql#wktLiteral