Based on my test, XML tags, when used as tags, are not checked by the spelling checker.
Oddly enough, when I used "LJ" (http://www,livejournal.com) as a link, it didn't show up as a misspelled word; when standing alone, "LJ" is considered a misspelling....
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Oddly enough, when I used "LJ" (http://www,livejournal.com) as a link, it didn't show up as a misspelled word; when standing alone, "LJ" is considered a misspelling....