[HACKERS] 7.2 result sets and plpgsql

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I've had a good look and to no avail. Can someone please answer me this:   -Can plpgsql functions be used to return multiple result sets in ver 7.2 at all? or is this only a feature enabled in 7.3?   If it is possible in 7.2 can you please give me an example that would return multiple rows.