Also broken parsers. So many broken parsers. Honestly this is what keeps JSON going: the parser was simple because the language was simple, and as a result any JSON you got basically worked the same way.
Not so with XML: all the parsers were insanely complex with the namespacing and whatnot feature support and possible external URLs and everything else...and as a result however no XML library was ever adequate to interface with anything. On multiple occasions generally the best way to build XML for something was to take a working copy, and then glue text together so you would exactly replicate whatever that specific application wanted, rather then trying to use anyone's library for it.
