Building and configuring the software. Options:
 * Ant
 * Maven

We have chosen for Maven. Maven follows the design principal "convention over configuration". If one follows the convention of Maven, very little needs to be done to build the software. With Ant a lot of configuration needs to be done. 

Maven is only used for the ebxml parts. GN itself works with Ant. Integration of Maven tasks within Ant is not difficult and might be done at a later stage.