The attribute defines the version of the XML file layout and is used by the compiler to identify if it is capable of compiling the XML file correctly. This should be set to the lowest version of izPack that will support the features used in the install.xml file. For a new project, this would be the major and minor parts of the current version. For izPack version 5.0.11, use version="5.0"
There is a number of possible embedded elements to describe the installation: