Question : Questions about namespaces

When reading about differences between Silverlight and WPF, I read this, but do not quite understand it.

•The only supported XAML namespace (http://schemas.microsoft.com/winfx/2006/xaml) constructs in Silverlight are: x:Null, x:Name, x:Key, and x:Class. Notable omissions here that exist in WPF or [MS-XAML] are x:Array, x:Code, x:Type, and code access modifiers, such as x:Subclass. x:Uid is permitted but ignored by the parser itself, and has no API connection point in Silverlight.

Could someone pleae explain what it means?

Thanks,
newbieweb

Answer : Questions about namespaces

WPF uses .net framework while silverlight app uses silverlight pulgin framework.

XML namespace is alias for assembly, so in case of WPF that namespace refers to different assembly than those of silverlight assembly.

To know more about what this namespace means
http://msdn.microsoft.com/en-us/library/cc189061(VS.95).aspx (Silverlight)
http://msdn.microsoft.com/en-us/library/ms747086.aspx (WPF)

So logically tough we use same namespace in both there is slight difference.