As usual, everything you need to know is in wikipedia. Short summary - both rules are valid somewhere, the second is the US English standard (and is often referred to as the typesetters rule), including the quote within only when it is part of the actual quote is the more complicated grammatical rule, which is more common in UK/Commonwealth English, but is very common in academic and technical (eg referring to computer language or URLs) uses anywhere, where it is important to know what exactly is part of the quote and what is not, and has become more common for reasons including nerds promulgating their language quirks via the internet.
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Date: 2008-01-15 10:21 am (UTC)