public sealed class To : Header, IValidation, 
	ISIPCloneable<To>

Public NotInheritable Class To
	Inherits Header
	Implements IValidation, ISIPCloneable(Of To)

public ref class To sealed : public Header, 
	IValidation, ISIPCloneable<To^>

[<SealedAttribute>]
type To =  
    class
        inherit Header
        interface IValidation
        interface ISIPCloneable<To>
    end