be-strict

Be strict in what you send but generous in what you receive

"Be strict in what you send but generous in what you receive" is a principle in computing (originally referring to e-mail), which suggests that systems (such as microformat parsers) should be very strict in making sure that their output confirms to standards, but flexible in interpreting data received, which may not adhere to the relevant standard, but whose meaning is still unambiguous.

(Anyone got a better explanation, references, or etymology?)