FrameXML is the in-house name for the part of Blizzard's standard World of Warcraft User Interface that is implemented in Lua, and hence fully replacable by users via AddOns.
For in-depth information about FrameXML, see:
- Interface Customization
- Category:FrameXML Documentation.
- HOWTO: View Blizzard's Interface Code - to extract all of FrameXML to regular files
- wdn.wowinterface.com - online FrameXML viewer