The following are the built-in-markup extentions in WPF:
1)Binding:- To bind the values of two properties together.
2)StaticResource:- One time lookup of a resource entry
3)DynamicResource:- Auto updating lookup of a resource entry
4)TemplateBinding:- To bind a property of a control template to a dependency property of the control
5)x:Static:- Resolve the value of a static property.
6)x:Null:- Return null