Ich bin ein Berliner

[AAllan at AOL.COM]

<< German does not use indefinite articles before professions, nationalities,
or cities of origin: Ich bin Professor; Ich bin Amerikaner; Ich bin
Hamburger; etc. Using indefinite articles in these types of constructions
is a common mistake of English speakers learning German. >>

I remember that rule too. But Reinhold Aman's article, extensively
documented, says that "ein" is an allowable variant. I hope Jerry finds the
citation soon. - Allan Metcalf