I've previously made mention of this idea in Suggestion: Optional Line Numbering Tag for CODE, though as we've already got problems getting newer users to use CDOE to start with, having an extra attribute may be tougher.

I think a better solution is to introduce another new tag, NCODE, which standard for "numbered code". Same effect as the above, of course, and probably easier to remember.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain