メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383064427942 43.7611756488677, 142.383360467417 43.7617330119274, 142.381865901087 43.7621555538717, 142.381859920028 43.7621443443275, 142.381577500631 43.7616149685026, 142.381266901953 43.7610865548819, 142.381259718336 43.7610739406938, 142.382753590339 43.7606540435847, 142.383064427942 43.7611756488677)) ^^http://www.opengis.net/ont/geosparql#wktLiteral