Section 3.32.5. AddToReply
Section 3.32.6. AddToReplyIfNotExist
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Section 3.32.7. DefaultReply
3.32.6. AddToReplyIfNotExist
This is similar to AddToReply, but only adds an attribute to a reply if and only if it is not already present in the reply. Therefore, it can be used to add, but not override a reply attribute. This is contributed by Vincent Gillet <vgi@oleane.net>.