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  1. In unit Soap.SOAPLinked.pas there are: 1. TLinkedWebNode 2. TLogLinkedWebNode = class(TLinkedWebNode) 3. TLinkedRIO = class(TRIO) in TLinkedRIO, it has two constructor: one is for: FLinkedWebNode := TLinkedWebNode.Create(nil); and another is for: FLinkedWebNode := TLogLinkedWebNode.Create(nil); My question is: if I want to create a new TLinkedWebNode like TLogLinkedWebNode, Just named it TMyWebNode, I must let TLinkedRIO has a new constructor that lets it create FLinkedWebNode as my new TMyWebNode. but, I can not modify Soap.SOAPLinked.pas because it is source code in Delphi. I will create a new pas file and inherit TLinkedRIO like TMyRIO = class(TLinkedRIO) and add a new constructor in it. but, the new TMyRIO in a new pas unit, I can not access FLinkedWebNode like FLinkedWebNode := TMyWebNode.Create(nil); So, is there any way to do that? or this is a design issue in Soap.SOAPLinked.pas and I must modify it?