メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.423510431036 43.8069597737312, 142.423463992137 43.8069391172367, 142.423256306092 43.8071692717615, 142.421157974193 43.8058419543494, 142.421385034552 43.8056413266194, 142.422242420044 43.8049066395892, 142.423295298458 43.8055706578524, 142.424367326564 43.8062300296911, 142.423510431036 43.8069597737312)) ^^http://www.opengis.net/ont/geosparql#wktLiteral