public abstract class DocumentBase : DocumentObject, 
	[T:spr⎣]

Public MustInherit Class DocumentBase
	Inherits DocumentObject
	Implements [T:spr⎣]

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

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