An Introduction to Tkinter. Ultimate++ Motif Programming. Extensible User Interface Lan. XUL: "XML-Based User Interface Language," or "XML User Interface Language," or "Extensible User Interface Language" -- depending upon the authority. The version 1.0 draft attests "XML User Interface Language. " XUL Project principals wrote in about 1999: "XUL stands for 'extensible user interface language'. It is an XML-based language for describing the contents of windows and dialogs. XUL has language constructs for all of the typical dialog controls, as well as for widgets like toolbars, trees, progress bars, and menus. "XUL is an XML based grammer for specifying the the static GUI. [March 29, 2002] "XUL Tutorial.
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