Professional XMPP starts off with a brief overview of XMPP followed by an overview of XMPP powered Web application architecture.  Once those building blocks are in place, the reader goes through implementing a series of more and more sophisticated applications which exercise various parts of the XMPP technology stack including a simple chat application, a microblogging client, a shared browsing project, collaborative editing, and a game.  The book concludes with some technical details on the XMPP to HTTP bridge and a few advanced topics like scaling and latency.   Coverage includes:

• XMPP stanzas, handlers, and events as XMPP stanzas are the core communication element, and all the applications will receive, process, generate, and extend these stanzas
• presence, which is one of the core building blocks of XMPP, enabling many of its social features
• group chat will be covered as a basis for more complex applications that involve collaboration
• Pubsub mechanics, which are useful in many common situations; Pubsub is one of the main reasons people are drawn toward XMPP technology.