title: Good tutorials on XMPP?
body: <p>I've been looking at some open-source XMPP servers, and am familiar with the official page <a href="http://xmpp.org/" rel="noreferrer">http://xmpp.org/</a>. But thus far I've not found anything in between "<em>The Extensible Messaging and Presence Protocol (XMPP) is an open technology for real-time communication</em>" and a list of XEP specifications. For instance articles explaining the basics and terminology - stanzas, IQ, presence, etc, etc. Even the <a href="http://en.wikipedia.org/wiki/Extensible_Messaging_and_Presence_Protocol" rel="noreferrer">Wikipedia</a> page misses this, unsurprisingly the open-source projects assume you know these things before you start digging into the code.</p>
  
  <p>Is there a good, (semi-)official set of tutorials on this? Do I need to be looking for Jabber resources rather than XMPP?</p>
  
  <p>Amongst other things, I'd hope to see diagrams for use-cases and flow, not just dry protocol text. I know books on XMPP exist, but generally anything in a book is available in some form online too.</p>