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   Step 5: Server informs client that it is allowed to proceed:

   <proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>
...
   </stream:features>

   Step 9: Client continues with SASL negotiation (Section 6).

   Step 1: Client initiates stream to server:

   <stream:stream
...
       <mechanism>PLAIN</mechanism>
     </mechanisms>
   </stream:features>