There are different Markup Extensions available to access from x prefix of the namespace declaration such as:
x:Static: Used when we want to accessstaticproperties, fields, orEnummembers in XAML elements.x:Reference: Used when we want to declare the reference of some named element into some other element of the same XAML Page.x:Type: Used when we want to set the type of some attribute toSystem.Typeobject.x:Array: Used when we want to construct the array of objects of some specific type.x:Null: Used when we want to set the value of some attribute to anull.