JSO is the JABBER� Stream Objects library, Java 2 Standard Edition (version 1.4). It is a low-level library that exposes the JABBER/XMPP protocol to users, allowing for maximum flexibility, at the expense of ease-of-use. It provides a custom and hightly-extensible object model, flexible stream control, extensible I/O support, and import/export facilities for XML strings and W3C DOM elements.

The objective is to provide a flexible and extensible foundation for building other JABBER applications and libraries. The library can be used for the development of clients, components, and stand-alone servers, or libraries that facilitate such applications.