There is a JSON XEP. I noticed that XML allows for pointing to custom schemas (vis semantic web) and feature discovery. It is what allows developers to iterate

There is a JSON XEP. I noticed that XML allows for pointing to custom schemas (vis semantic web) and feature discovery. It is what allows developers to iterate on extensions without breaking compatibility As far as efficieny, XMPP powers some very large deployments: Apple Push Notifications, Google GTalk, even WhatsApp is a modified XMPP.