1. Dynamic discovery of add-ons
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## 1. Dynamic discovery of add-ons

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, non-XML format and virtual drive plug-ins,

- customizations of XXE GUI.

Understanding this is important before learning how to deploy XXE.

### About the integrated add-on manager

What is described in this chapter is not related to XXE integrated add-on manager (menu item Options|Install Add-ons).

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.

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