The Rosetta Stone has become something people talk about. I had the chance to see the real thing recently, in the BritishMuseum in LondonTown. Here are some facts as background. -- JohnFletcher
The point of this is that there was no intention by the originators to provide a parallel text as a crossindex. That is an accident of the survival of the stone.
See: http://en.wikipedia.org/wiki/Rosetta_Stone
Also The Rosetta Stone Richard Parkinson, ISBN 0-7141-5021-5, British Museum Press, 2005 has more information. The BritishMuseum also sell a mouse mat copy of it!
Examples of use of the idea: FunctionalImperativeRosettaStone KeyboardClaw RosettaCode