No. One of the problems of XML is that it's binary-intolerant, which means everything that isn't pure text is a second-class citizen. That means pictures, sound

No. One of the problems of XML is that it's binary-intolerant, which means everything that isn't pure text is a second-class citizen. That means pictures, sounds, documents, compressed stuff and most importantly, any encryption. We've all agreed that encryption is now considered to be mandatory and must be included in a protocol right from the start, so any serialization that doesn't allow easy binary usage can't be used.