Introduction
Theme is a program which allows you to build a 'theme' consisting of colour schemes, pixmaps, backgrounds, etc. for an abstract window manager.
Theme defines an XML application for its abstract window manager, and can translate this into configuration files / themes for concrete window managers using plugins.
If all software development is maintenance, and the initial development of a program is maitnenance on the 'zero state' program, then 'theme' is the zero state program.