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I can see that uppercase letter means default here. Is there a standard for this? I'd like to read the full standards.

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I dont know of a a written standard, But historically the uppercased letter is the default on y/n choices. It's always been that way as far back as i can remember. – Sirex Jul 1 '11 at 6:54
I think the name of the involved "standard" is "Common sense." What makes you think there are standards for everything? – alex Jul 1 '11 at 16:47
up vote 2 down vote accepted

It isn't a written standard, it is, however, a de facto standard, meaning it had been used and found useful, so it came to be the common way to do things.

As Alex said - from common sense.

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