Microsoft just published two specifications today, they can be  downloaded from  http://www.microsoft.com/downloads/details.aspx?FamilyId=3356AF19-A36E-4D6D-9D13-C37DB81EE607&displaylang=en [MS-XAML] Xaml Object Mapping Specification 2006 - this describes Xaml's rules. [MS-WPFXV] WPF Xaml Vocabulary Specification 2006 - ...