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The name may fool you, it's not like it is too advanced but it shows a neat alert when you gather enough quest XP to level up, so if you are sick of a zone and would like to get away from it as fast as possible, this let's you know when you can stop grinding.
Works right out of the box. If you wish you can edit the core.lua file in Notepad (or any other plain text editor) to tweak a couple of settings.
Look at the top part of the file, namely the table called "AdvancedXPBarDB":