The Extensible Messaging and Presence Protocol (XMPP) is an IETF standard protocol for exchanging information between network endpoints using Extensible Markup Language (XML). It is used to enable instant messaging and presence applications and is growing in popularity. This Recommendation includes XMPP in the suite of protocols that is supported in [ITU-T H.350], so that an organization can directory-enable and manage XMPP resources in the same way that other multimedia protocols (e.g., H.320, H.323, SIP) are managed in [ITU-T H.350]. The schema provides a method for representing XMPP URIs and user information in the directory. Note that this Recommendation defines representation of URIs and not IRIs, as described in [IETF RFC 4622].