メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.703695876728 44.3638964187911, 141.703451564287 44.3640555299219, 141.703150162358 44.364245656916, 141.703112794456 44.3642692095469, 141.70274816924 44.3639805732453, 141.7020231188 44.3634054615732, 141.702059799964 44.3633820823942, 141.702628963361 44.3630193571611, 141.703079163564 44.3627324543005, 141.703273602275 44.3628873776438, 141.704160483156 44.3635939022892, 141.703695876728 44.3638964187911)) ^^http://www.opengis.net/ont/geosparql#wktLiteral