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This has been obvious for 20 years, which is why XML took great pains to avoid the "robustness principle". Old Internet protocols like FTP are nearly impossible to make fully interoperable because of "robustness".
ietf.org/id/draft-iab-p…
ietf.org/id/draft-iab-p…
The principle being "strict in what you send and liberal in what you receive" was important in 1980 when people didn't know how to write protocols, and "partially working" was an acceptable goal.
Nowadays people know how to write protocols, and "reliably working" is the new goal. Being liberal in what you receive is counterproductive.
Getting rid of liberalness in what you receive is an important part of the development of such protocols as DNS, SSL, and X.509 certificates. They are trying to clean up decades worth of "robustness principle" that makes interoperability harder than it needs to be.
