SWI-Prolog -- Origin and Copyright

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Origin and Copyright

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Documentation
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  - SWI-Prolog Natural Language Processing Primitives
    - Porter Stem -- Determine stem and related routines

2.1 Origin and Copyright

The code is based on the original Public Domain implementation by Martin Porter as can be found at http://www.tartarus.org/martin/PorterStemmer/. The code has been modified by Jan Wielemaker. He removed all global variables to make the code thread-safe, added the unaccent and tokenize code and created the SWI-Prolog binding.