SWI-Prolog -- unaccent

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

Availability::- use_module(library(porter_stem)).(can be autoloaded)

unaccent_atom(+In, -ASCII)

If In is general ISO Latin-1 text with accents, ASCII is unified with a plain ASCII version of the string. Note that the current version only deals with ISO Latin-1 atoms.