The XMPP protocol includes a base protocol and many optional extensions typically documented as "XEP's". Smack provides the org.jivesoftware.smack package for the core XMPP protocol, and the org.jivesoftware.smackx package for many of the protocol extensions.
This manual provides details about each of the "smackx" extensions, including what it is, how to use it, and some simple example code.
| Name | XEP # | Description |
| Private Data | XEP-0049 | Manages private data. |
| XHTML Messages | XEP-0071 | Allows send and receiving formatted messages using XHTML. |
| Message Events | JEP-0022 | Requests and responds to message events. |
| Data Forms | JEP-0004 | Allows to gather data using Forms. |
| Multi User Chat | JEP-0045 | Allows configuration of, participation in, and administration of individual text-based conference rooms. |
| Roster Item Exchange | XEP-0093 | Allows roster data to be shared between users. |
| Time Exchange | XEP-0090 | Allows local time information to be shared between users. |
| Group Chat Invitations | N/A | Send invitations to other users to join a group chat room. |
| Service Discovery | XEP-0030 | Allows to discover services in XMPP entities. |
| File Transfer | XEP-0096 | Transfer files between two users over XMPP. |
| PubSub | XEP-0060 | Generic publish and subscribe functionality. |
| Entity Capabilities | XEP-0115 | Generic publish and subscribe functionality. |