[Haskell-cafe] US Patent for the idea of using Haskell to implement UAX #9

Paul Johnson paul at cogito.org.uk
Mon Apr 19 18:21:03 EDT 2010

This patent has zero practical impact.

When the patent was written there was no Unicode support, so the 
implementation translates the input into lists of integers instead of 
lists of characters.  Crucially this step was also written into all 
three independent claims (which are the only bit of a patent that 
actually matters).  So you are free to re-implement this algorithm 
provided that you manipulate lists of characters rather than lists of 
integers.  Now that GHC has full unicode support this should not be a 


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