There is no file format that works out of box under all extreme corner cases.
You would think that ie XML-defined WSDL with XSD schema is well battle proven. I've encountered 2 years ago (and still dealing with that) WSDL from a major banking vendor that is technically valid, but no open source library in Java (from all languages) was able to parse it successfully or generate binding classes out of box.
Heck, flat files can end up with extreme cases, just work enough with legacy banking or regulatory systems and you will see some proper shit.
The thing is, any sort of critical integration needs to be battle tested and continuously maintained, otherwise it will eventually go bad, even a decade after implementation and regular use without issues.
You would think that ie XML-defined WSDL with XSD schema is well battle proven. I've encountered 2 years ago (and still dealing with that) WSDL from a major banking vendor that is technically valid, but no open source library in Java (from all languages) was able to parse it successfully or generate binding classes out of box.
Heck, flat files can end up with extreme cases, just work enough with legacy banking or regulatory systems and you will see some proper shit.
The thing is, any sort of critical integration needs to be battle tested and continuously maintained, otherwise it will eventually go bad, even a decade after implementation and regular use without issues.