Programming Microsoft® ASP.NET 3.5

The Silverlight Object Model

The content of a XAML file doesn't have to be static and read only. With some JavaScript code, for example, you can make it react to runtime events. The script code can affect it in either of two ways. First, the script code can be embedded in the XAML and essentially handle events raised by XAML elements. Second, the script code is part of the host page and is used to get and set values on the public properties of XAML elements.

Silverlight Programming Fundamentals

Even in the simplified version of XAML you have in Silverlight 1.0, the XAML language is a real application-delivery format and a much more powerful option than a simple document format such as HTML. With XAML, you can easily embed graphics and media capabilities ...