base library for XMPP based instant messaging and presence

 JXMPP is an Open Source Java base library for XMPP. It provides often used
 functionality needed to build an XMPP stack.
 .
 jxmpp-core: Provides core functionality most software that interacts with XMPP
 requires: XmppDateTime, XmppStringUtils, XmppStringPrepUtil.
 .
 jxmpp-jid: Provides API that abstracts XMPP JIDs with Java classes, performing
 string preparation and validation.
 .
 jxmpp-util-cache: Provides a lightweight and efficient Cache without external
 dependencies used by various JXMPP Components.
 .
 jxmpp-strings-testframework: A framework to test "XMPP Strings".