[Standards] Re: Atom Over XMPP and element atom:link

While there is a fairly obvious interpretation here if the type attributes differ, I agree with your reading of the RFC that it is invalid to have multiple content. Thus we should fix the XEP and also any software currently following the XEP example. I doubt there is any benefit to bending over backward to include such a link, though of course someone could if they want to in pracise I doubt they will and I don't think we need to mention it specifically in the XEP. Realistically, no one is using the "fallback" content much anyway and it's clear from the RFC that they didn't consider this a reasonable use case which I mostly agree with in hindsight.