Here is all the xml element used in the header block. As this block is read directly from the file, it can not contains autogen variables.
<project-wizard> <_name> <_description> <icon> <category> </project-wizard>
It represents the header block, and contains all other elements.
<_name> text </_name>
text is the name of the project, its name start with a underscore to mark a translatable element.
<_description> text </_description>
text gives a short description of the project, it appears when the project is selection. It's a translatable element too which explains the underscore.
<_icon> filename </_icon>
filename is the name of the file containing a icon for the project, it must be in the same directory than the project template file. The picture must be of 48 by 48 pixels in png format.
<_category> text </_category>
text is a category name. It is a way to group related project, it is typically the programming language name, like C or C++.
<_order> number </_order>
number is used to order project in the project selection view. If this element is not specified order is equal to 0. In this case, the projects are added at the end ordered according to their names.