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Don't end XHTML IDs with punctuation
An ID ending with a punctuation character means that a URL with a fragment ID linking to that section ends with a punctuation character. Such URLs are awkward to extract from plain text, for example when used in a plain text e-mail and being converted to a link by a mailing list archive or e-mail client: a punctuation character at the end of a URL may be interpreted as punctuation in the e-mail message following the URL. Avoid the problem by ensuring that IDs never end with punctuation characters. (Underscore is allowed, since it isn't used for punctuation in human text.)
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