Not only that, but before the TLS session starts you have to handle an invalid XML document (the starttls mechanism start encrypting stuff right in the middle of the initial XML document).
Also some XML constructs are not valid in XMPP (like comments)
I think rolling out your own XML parser for XMPP is a fairly reasonable thing to do. In the past at least, many, if not most, implementations had their own parser (often a fork of a proper XML parser). What is more surprising to me is why would they choose XMPP for their proprietary stuff. I don't think they want to interroperate or federate with anything?
(if I remember correctly and if it hasn't changed compared to many years ago, when I looked at that stuff.)
I think rolling out your own XML parser for XMPP is a fairly reasonable thing to do. In the past at least, many, if not most, implementations had their own parser (often a fork of a proper XML parser). What is more surprising to me is why would they choose XMPP for their proprietary stuff. I don't think they want to interroperate or federate with anything?
(if I remember correctly and if it hasn't changed compared to many years ago, when I looked at that stuff.)