Since some years, there are new XMPP RFCs:
You can see here more informations on https://tools.ietf.org/wg/xmpp/
Issues tracking the compliance of the new RFCs already exists
6120 -> 7590: https://tools.ietf.org/html/rfc7590
6122 -> 7622: https://tools.ietf.org/html/rfc7622