Packages
org.jivesoftware.smackx.packet XML packets that are part of the XMPP extension protocols.
org.jivesoftware.smackx.provider Provides pluggable parsing logic for Smack extensions.
org.jivesoftware.smackx.pubsub  
org.jivesoftware.smackx.pubsub.listener  
org.jivesoftware.smackx.pubsub.util