UIML (User Interface Markup Language) is an XML-based user interface markup language for defining user interfaces on computers. Basically UIML tries to reduce the work needed to develop user interfaces. It allows you to describe the user interface in declarative terms (i.e. as text) and abstract it. Abstracting means that you don't exactly specify how the user interface is going to look, but rather what elements are to be shown, and how should they behave. For example, to describe a message window, you could write:
<part class="DialogMessage" name="HelloWorld"/>
In theory then you could use that description to generate user interfaces for different platforms, like PDAs. In practice, the different capabilities of those different platforms make a complete translation difficult. Other less ambitious domain-specific programming languages attempt only to describe the user interfaces (or other parts of the application or process) in a domain (for example Windows). See for example the Microsoft language XAML. These languages do a better job usually, but are less flexible.
- UIML.Net A free UIML renderer written in C#. It has been developed at the Expertise Centre for Digital Media (Hasselt University, Belgium) and can render a UIML document using different widget sets and different platforms.
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