a boundingbox as child of a Polygon isn't part of the iso19107 spec but it simplifies the
geometry handling
version: $Revision: 9343 $ author: Andreas Poth author: last edited by: $Author: apoth $ version: 1.0.
default implementation of the Ring interface of the
version: $Revision: 9343 $ author: Andreas Poth author: last edited by: $Author: apoth $ version: 1.0.