xml - USE of XAML not related to WPF or silverlight -

I'm trying to understand the use of XML, rather than markup it in creating WPF and Silverlight applications. I am using. Please give me all the possible uses of XAML, where I and XAML can be used.

Can XAML be used as regular XML for mapping and related accessories?

Please provide some links where I can learn about XAML.

Thank you.

This writing can be useful:. This article describes a way that XAML can be used as a user for the user interface, but also for the other CLR objects as a form of a validation format.