[Standards] UPDATED: XEP-0503 (Server-side spaces)

Version 0.3.0 of XEP-0503 (Server-side spaces) has been released. Abstract: This document defines an XMPP protocol to cluster several groupchat rooms together. Changelog: * Fix pubsub node field name in room disco info. * Specify how to attach images (avatar and banner) to a space. (nc) URL: https://xmpp.org/extensions/xep-0503.html Note: The information in the XEP list at https://xmpp.org/extensions/ is updated by a separate automated process and may be stale at the time this email is sent. The XEP documents linked herein are up-to- date.