May 102017
 

So I don’t forget:

Adding a comment to an existing IXMLNode is simple, once you find out how:

var
  CommentNode: IXMLNode;
begin
  CommentNode := ParentNode.OwnerDocument.CreateNode('comment text', ntComment);
  ParentNode.ChildNodes.Add(CommentNode);

This is documented in the DocWiki

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