Ilya Grigorik said
An equally great book if you are new to XMPP, or if you are an architect or a developer who has been previously exposed to the technology. Placing myself in the latter camp (worked on an asynchronous XMPP Ruby client), I found this book to be very useful for filling in the technical gaps. While the XMPP spec is a well written one, it is still hardly an enjoyable read. The authors did a great job between balancing the technical details and adopting an informal style which allows them to compress the specification into easily digestible chapters (they give you the basics, you're free to read the full spec).
The book covers all the major components: overall architecture, handshake, presence protocol, multi-user chat, data transfers, security, etc. If you're thinking about adopting XMPP, you should pick up a copy.
java web app developer said
This is a great book for someone wanting to get a grip on XMPP. It covers from the basics all the way to recent additions to the protocol. It does help if you already have some introductory knowledge of what XMPP is about, but I think it would be suitable for complete newbies as well. The chapters are short and each one covers a specific aspect of the protocol -- so you don't necessarily have to read the book from beginning to end. The book is written in a very informal style, almost making it a light read, while immersing you in a lot of information.
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