The module is inherited from ModuleBase. So base parameters can be found there.
This module is great for organizing your mod into parts. If you always hated putting everything in the same XML but didn't want to use the file parameter this makes it easy to organize many modules into separated files.
The name of the module you use as the meta of the module definition is 'XML' or 'XMLModule' if _force_search is set to true in the module definition.
<XML path file_type>
The path to the XML file that should be loaded
An optional list of modules that should load first
The type of file that should load [Default: custom_xml] can be custom_xml, generic_xml an json.
This example is what you would put inside your main node within your mod config
This will load the file Extra.xml and read the modules that are inside of it.