public abstract class DocumentContainer : DocumentBase, 
	[T:spr⎤], [T:spr⎣]

Public MustInherit Class DocumentContainer
	Inherits DocumentBase
	Implements [T:spr⎤], [T:spr⎣]

public ref class DocumentContainer abstract : public DocumentBase, 
	[T:spr⎤], [T:spr⎣]

[<AbstractClassAttribute>]
type DocumentContainer =  
    class
        inherit DocumentBase
        interface [T:spr⎤]
        interface [T:spr⎣]
    end