March 2018
Beginner to intermediate
410 pages
10h 40m
English
The XMPP protocol is based on the Extensible Markup Language, or XML. It is XML that makes the protocol extensible, in a well-defined manner. Since XML elements are defined by namespaces, it is easy to mix content from different parties, without mixing meaning or semantics. Namespaces also provide a mechanism to control versioning and maintaining backward compatibility as interfaces are developed. As long as you control a namespace, for instance, by using your own domain, you can freely extend the protocol with anything you like, without negatively affecting other entities in the network.
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