Oooh, that's a (well, several) much better ideas then I'd thought of -- I was thinking of checking if it's valid utf8, and if it is, assuming that it was, indeed, UTF8. (This is not as bad as it may appear -- in purticular, plain ole ASCII text is valid utf8, and valid latin-1, with exactly the same meaning, so it doesn't matter. Latin-1 that uses high-half characters is unlikely, from a linguistic standpoint, AFAIK, to be vaild utf8.)

I really like the enc="éñÇ" idea, though.