anchor.diff:           chat/3,
            chat_to_short_jid/2,
            chat_without_carbon_to/2,
  +         chat_to_with_id_and_timestamp/2,
  +         chat_to_with_id/2,
            groupchat_to/2,
            iq_result/1,
            iq_result/2,
  
positive.code:     Stanza#xmlel{children = Children ++
                    [#xmlel{name = <<"private">>,
                            attrs = [{<<"xmlns">>, ?NS_CARBONS_2}]}]}.
  
  receipt_req(#xmlel{ name = <<"message">>,
                      attrs = Attrs,
  
negative.code:          to/2,
           from/2,
           tags/1,
           set_id/1,
           set_id/2,
           set_current_timestamp/1,
           uuid_v4/0]).
  
  -export([get_registration_fields/0,
  