メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.37494963032 43.7622897271874, 142.375238709489 43.7628388888629, 142.373741635968 43.7632682170977, 142.373446460145 43.7627214141146, 142.373171375515 43.7621921520717, 142.374652653527 43.7617539869371, 142.37494963032 43.7622897271874)) ^^http://www.opengis.net/ont/geosparql#wktLiteral