This section describes how XXE discovers and loads add-ons (that is, extensions) of all types:
configuration files,
XML catalogs,
translations of XXE messages (menu labels, button labels, error messages, etc) to languages other than English,
spell-checker dictionaries,
XSL-FO processor, image toolkit and virtual drive plug-ins,
customizations of the XXE GUI.
Understanding this is important before learning how to deploy XXE.
What is described in this chapter is not related to XXE integrated add-on manager (menu item
→ ).The integrated add-on manager is just a facility which, in order to install add-ons, follows the rules described in this chapter.
For example, in order to install an add-on packaged as a Zip archive, the add-on manager simply unzips this archive in one of the two addon/
directories scanned by XXE at startup time.