"This document improves the security of the Extensible Messaging and Presence Protocol (XMPP) in two ways. First@ it specifies how to establish a strong association between a domain name and an XML stream@ using the concept of ""prooftypes"". Second@ it describes how to securely delegate a service domain name (e.g.@ example.com) to a target server hostname (e.g.@ hosting.example.net); this is especially important in multi-tenanted environments where the same target server hosts a large number of domains."