[NTG-context] Re: index sort order (de)

[Henning Hraban Ramm <texml@fiee.net>]

Would any of the German users object to a change of the default?

Am 14.05.24 um 18:57 schrieb Henning Hraban Ramm:
> 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 IMO, "Duden" is obsolete, should be the same as default; it makes no 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 I’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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