We configure both baseletter conversion (removing accents and umlauts) and
alternate spelling through the mapping file.
For baseletter conversion and mostly german content we transform all accents
that are not used in german language (like french é, è, ê etc.) to their
baseletter. We do not do do this for german umlauts, because the assumption is
that a user will know the correct spelling in his or her native language but
probably not in foreign languages.
For alternate spelling, we use the following mapping:
# * Alternate spelling
#
# Additionally, german umlauts are converted to their base form ("ä" => "ae"),
# and "ß" is converted to "ss". Which means both spellings can be used to find
# either one.
#
"\u00C4" => "AE"
"\u00D6" => "OE"
"\u00DC" => "UE"
"\u00E4" => "ae"
"\u00F6" => "oe"
"\u00DF" => "ss"
"\u00FC" => "ue"
André
