XEP-0238 (XMPP Protocol Flows for Inter-Domain Federation) has been Deferred because of inactivity.
Abstract: This specification provides detailed protocol flows for the establishment of communication between domains that provide XMPP services, including permutations for a wide variety of possible federation policies. URL: http://www.xmpp.org/extensions/xep-0238.html If and when a new revision of this XEP is published, its status will be changed back to Experimental.