The XAML Syntax
The XAML language is a complex and very flexible markup language applied to different technologies by using different references in the XAML file so that you can refer to different objects that provide different XAML elements and attributes.
Like any other XML file, a XAML file must have a valid structure and must follow some specific rules; one of these rules is the presence of a valid root element.
Namespaces and Root Elements
In XAML you define a root element as the root of your XAML document; this is a mandatory requirement for the XAML file and for the XML validation. In a WPF context, the root element of a XAML file will be a Page, UserControl, or Window if you are creating a UI container or a simple ResourceDictionary
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