UIML stands for User Interface Markup Language and is an application of XML to describe user interfaces. Normally people think of using XML for describing documents or data. But as it is just a formalism it may be used for any kind of structured data. There are tools which convert an UIML representation to the representation for various GUIs (e.g. Java awt[?]).
XUL (Xml User-interface Language) provides similar functionality as UIML and is used for the Mozilla web browser.
... town is 95.45% White, 0.84% African American, 0.13% Native American, 1.89% Asian, 0.03% Pacific Islander, 0.62% from other races, and 1.04% from two or more races. 3.33% ...