Hi,
I checked the German index sorting rules, and as far as I can tell, all
of them are somewhat wrong.
– de, default, or no setting (just mainlanguage de)
– Duden
- DIN 5007-1(:2005)
- DIN 5007-2(:1996)
- de-AT
IMO, "Duden" is obsolete, should be the same as default; it makes no
sense to have a default setting that doesn’t adhere to the official
rules. If Û#m not mistaken it’s also the same as DIN 5007-1; maybe there
was a difference before 2005. (DIN 5007-2 and de-AT have their uses.)
The order of umlauts etc. should be ok.
[ß]
In tex/context/base/mkiv/sort-lan.lua, ß is replaced by s, while it
should be sorted like ss in default and both DIN versions. (de-AT sorts
ss after ß.)
[upper-/lowercase]
While casing is not mentioned in Wikipedia
(https://de.wikipedia.org/wiki/Alphabetische_Sortierung), Duden „Satz
und Korrektur“ says:
Uppercase characters get sorted the same as lowercase (i.e. mixed), but
if both appear, lowercase comes first.
ATM all German settings sort lowercase behind uppercase.
Generally, default method seems to be not "default" but "before". Does
this make sense?
If we look at the method presets, there’s none for {zm,pm,zc,zm,uc}
(upper like lower, ignore diacritics – basic default for German).
"""
\mainlanguage[de]
\setupregister[index][language=de]
\starttext
\index{Apfel}
\index{Äpfel}
\index{apfel}
\index{äpfel}
\index{aepfel}
\index{Aepfel}
\index{Ápfel}
\index{ápfel}
\page
\completeindex
\stoptext
"""
default order should be:
aepfel
Aepfel
apfel
Apfel
äpfel
Äpfel
ápfel
Ápfel
aqua
DIN 5007-2 sorts like:
aepfel
Aepfel
äpfel
Äpfel
apfel
Apfel
ápfel
Ápfel
aqua
de-AT sorts like:
aepfel
Aepfel
apfel
Apfel
aqua
äpfel
Äpfel
ápfel
Ápfel
Hraban
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