作为一个XMPP客户端，除了需要实现RFC 3920和RFC 3921之外，下面所列的XEP也是一个基本的要求，下面的介绍摘自我所写的一个文档中，所以感觉不是很完整，但是也可以作为一个XMPP客户端的参考。
1、 Introduction
This document describes the IJPE list supported by client product.
2、 XEPs
XMPP Extension Protocols (XEPs) are the vehicle for standardization of protocol XMPP Standards Foundation (XSF). A XEP details a protocol typically aimed at meeting a particular functional need, such as multi-user-chat or pubsub. This section lists XEPs supported by client.
2、1 XEP-0016: Privacy Lists
version 1.6 is fully supported.
2、2 XEP-0030: Service Discovery
version 2.4 is fully supported.
2、3 XEP-0045: Multi-User Chat
version 1.24 is fully supported.
2、4 XEP-0049: Private XML Storage
version 1.2 is fully supported.
2、5 XEP-0050: Ad-Hoc Commands
version 1.2 is fully supported.
2、6 XEP-0065: SOCKS5 Bytestreams
version 1.7 is fully supported.
2、7 XEP-0071: XHTML-IM
version 1.4 is fully supported.
2、8 XEP-0085: Chat State Notifications
version 2.1 is fully supported.
2、9 XEP-0096: SI File Transfer
version 1.1 is fully supported.
2、10 XEP-0115: Entity Capabilities
version 1.5 is fully supported.
2、11 XEP-0249: Direct MUC Invitations
version 1.1 is fully supported.