This property only has a non-null result if the NodeType of the current position is NamespaceDeclaration. This property does not report the XAML namespace that applies to objects or members in a general scoping sense. Your implementation should cache XAML namespace information if you need it for specific operations. For default operations that involve the loaded XAML schema context, the acting XAML namespace is internally cached by XAML writer implementations.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)