The file Package.def is part of every package. It defines the position of the package in the PackageGroup.

A typical example (excerpt from SoUtils.pro):

      Package {
      packageGroup = MeVisLab
      packageName  = Standard

      owner = "MeVis Medical Solutions"
      description = "Standard MeVisLab Modules"
      }

	Note
	In principle, the package structure is defined by Package.def. However, the implementation of the package handling expects that all packages are below their PackageGroup.