Hans,
I have just discovered the following:
\define[1]\indx{#1\index{#1}}
\starttext
\indx{an} \indx{american} \indx{Aphrodite}
\placeindex
\stoptext
Lowercase letters are placed after its uppercase counterparts.
I don’t have (almost) any experience with indices in ConTeXt, but which
is the way to turn this off?
Sorry, but I don’t see a reason to have this as default. I mean, I have
never seen any encyclopedia or dictionary that sorts entries according
to letter case.
I believe you want method=default for your \setupregister[index][]
options. The allowable values appear to be default, first, last,
before, and after. With nothing specified you do not get the same as
specifying default. I asked about these a while back but got no
answer. There is a cryptic explanation from 2010 at