Some XEPs soprani.ca features tend to rely on:

* https://xmpp.org/extensions/xep-0184.html
* https://xmpp.org/extensions/xep-0234.html
* https://xmpp.org/extensions/xep-0261.html
* https://xmpp.org/extensions/xep-0100.html (especially [[https://xmpp.org/extensions/xep-0100.html#addressing-iqgateway|jabber:iq:gateway]])
* https://xmpp.org/extensions/xep-0066.html#x-oob
* https://xmpp.org/extensions/xep-0050.html
* https://xmpp.org/extensions/xep-0030.html