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

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

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

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