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Why does general interoperability matter in the context of two devices that you control both interoperating? I mean, if I had written the software on the other end I would've used a different interchange format altogether. But when you constrain the problem down from your software connecting to any and all systems on the internet to your software connecting to a specific system for the purpose of exchanging well-defined messages, you don't need a general-purpose parser with validation. And you end up spending a lot of time validating and analyzing the same message over and over again even though you can guarantee that it's the same message.



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