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Originally Posted by Brian Cummiskey

No, you can't block parameters with robots, just scripts or paths themselves, thus doing so would block everything.

Disallow: ?langid* would block everything?

I don't think that would do anything. Robots blocks pages/urls, not parameters.

I see nothing in the spec about being able to block params alone.
http://www.robotstxt.org/norobots-rfc.txt