メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.326574522928 43.7638953698147, 142.326939119132 43.7640064616541, 142.32705412609 43.7640414921511, 142.326710179979 43.7646361332144, 142.326416925992 43.7651449998988, 142.326405726479 43.7651417372838, 142.325906300288 43.7649869944075, 142.325157151456 43.7647462874448, 142.32523623548 43.7646141362798, 142.325805580571 43.7636604291145, 142.326534289756 43.7638830733232, 142.326574522928 43.7638953698147)) ^^http://www.opengis.net/ont/geosparql#wktLiteral