public sealed class Subject : Header, 
	ISIPCloneable<Subject>

Public NotInheritable Class Subject
	Inherits Header
	Implements ISIPCloneable(Of Subject)

public ref class Subject sealed : public Header, 
	ISIPCloneable<Subject^>

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