A few conventions are used throughout this guide regarding several concepts:

Booleans. Whenever we need to talk about a boolean value passed to a method or returned by it, we will refer to a true value as true and to a false value as undef or false.

Perl modules and eBox modules. There may be some confusion in some parts of the guide about the term module as the term may refer to an eBox module or a perl module. An eBox module is the complete set of classes (and perl modules) and other files that provide a self-contained functionality for eBox and that may be installed or uninstalled independently from the rest of eBox. A perl module is basically a perl source file.

Whenever there is no possibility of confusion, we'll just write module, otherwise we'll write explicitly perl module since this meaning will be the one used less frequently.