Hi Rik,

On 26 Aug 2021, at 03:14, Rik Kabel via ntg-context <ntg-context@ntg.nl> wrote:

List,

I am trying to create an index with both "see" and "see also" cross-reference entries.[1] At this point, ConTeXt provides basic support for "see" entries via the \seeREGISTER command (it does not properly support references to sub-entries) and it provides no support at all for "see also" entries.

Can somebody suggest a way to generate these entries? Perhaps a way of inserting entries into the index before it is formatted, in the     manner of \writetolist or \writebetweenlist? (MkII has \writetoregister, but that did not carry forward and I do not know if it would have helped here.)

Since strc-reg.mkiv starts with a number of ’todo’ comments, I think your best bet is to create an
actual functional example along with an explanation of what you want the typeset result to look 
like in the cases where it is not doing what you want.

Generally, explicit examples / test files are the best way to get replies to questions 
(either by Hans or anyone else).

The following produces what I am looking for, and a bit more. Page 3 of the output shows what I would like to see, page 4 is the generated index. I don't really need the "see under" and "see also under" variants, but they would be nice to have. I am indifferent to having stops before "see also"s. I would like to be able to turn checking on or off, so that generic directives (in the example, see also specific breeds) will not generate an error, while the Ford Prefect example will generate an error.

   \defineprocessor[also][color=blue]
   \defineprocessor[under][color=green]
   \defineprocessor[alsounder][color=orange]
   \define\seealsoindex\seeindex
   \define\seealsounderindex\seeindex
   \define\seeunderindex\seeindex
   \setupinteraction [state=start]
   \setupregister    [index][balance=no,check=no]

%% seeindex entries may start on the same line as their head entry
   \seeindex         {dog breeds+Wiener dog}{dog breeds+Dachshund}
%%  The next example should not work,
%%    since there is no main entry /Adams, Douglas/
   \seeindex         {Prefect, Ford}{Adams, Douglas}

%%  When referring to a subentry, the target must be a subentry,
%%    but should display as if a main entry. The next example
%%    should point to the /Adams+Douglas/ subentry, but it
%%    should be formatted as if it were /Adams, Douglas/
   \seeindex         {Dent, Arthur}{Adams+Douglas}

%% The following two work as expected
   \seeindex         {Matilda effect}{obliteration}
   \seeindex         {Marut, Ret}{Traven, B.}

%% seealso should be placed after as a subentry after real page references
%% seealso should have an appropriate label (default English /see also/)
   \seealsoindex     {pseudepigraphy}{also->obliteration}
   \seealsoindex     {dog breeds}{also->breeding programs}
   \seealsoindex     {dog breeds}{also->specific breeds}
%% seealsounder is like seealso except that it refers to a main entry
   \seealsounderindex{Coton de Tulear}{alsounder->dog breeds}
%% seeunder also is like seealso except that it refers to a main entry
   \seeunderindex    {Weimaraner}{under->dog breeds}
   \starttext
     Stuff
     \index{obliteration}
     \index{Adams+Douglas}\index{Adams+John}
     \index{Beagle}
     \index{dog breeds+Beagle}
     \index{dog breeds+Coton de Tulear}
     \index{dog breeds+Dachshund}
     \index{dog breeds+Weimaraner}
   \page
     More stuff
     \index{Adams+John Quincy}
     \index{misquotation}
     \index{pseudepigraphy}
     \index{Traven, B.}
     \index{Beagle}
     \index{Coton de Tulear}
     \index{breeding programs}
   \page
   \definedescription[Index][headstyle=bold,alternative=top,inbetween=]
   \startIndex{a}
     Adams\par
     \quad \reference[AdamsDouglas]{Adams, Douglas}Douglas\quad 1\par
     \quad John\quad 1\par
     \quad John Quincy\quad 2\par
   \stopIndex
   \startIndex{b}
     Beagle\quad 1, 2\par
     \reference[breedingprograms]{breeding programs}breeding programs\quad 2
   \stopIndex
   \startIndex{c}
     Coton de Tulear\quad 2.\par
     \quad {\em See also under} \in[dogbreeds]
   \stopIndex
   \startIndex{d}
     \reference[DentArthur]{Dent, Arthur}Dent, Arthur {\em see} \in[AdamsDouglas]\par
     \reference[dogbreeds]{dog breeds}dog breeds\par
     \quad \reference[dbBeagle]{dog breeds, Beagle}Beagle\quad 1\par
     \quad \reference[dbCoton]{dog breeds, Coton}Coton de Tulear\quad 1\par
     \quad \reference[dbDachshund]{dog breeds, Dachshund}Dachshund\quad 1\par
     \quad \reference[dbWeimaraner]{dog breeds, Weimaraner}Weimaraner\quad 1\par
     \quad Wiener dog\quad {\em see} \in[dbDachshund]\par
     \quad{\em See also} \in[breedingprograms] {\em and specific breeds}
   \stopIndex
   \startIndex{m}
     Marut, Ret\quad {\em see} \in[TravenB]\par
     Matilda effect\quad {\em see} \in[obliteration]\par
     \reference[misquotation]{misquotation}misquotation\quad 2
   \stopIndex
   \startIndex{o}
     \reference[obliteration]{obliteration}obliteration\quad 1\par
     \quad{\em See also} \in[misquotation] {\em and} \in[pseudepigraphy]
   \stopIndex
   \startIndex{p}
     Prefect, Ford\quad {\em see Adams, Douglas}\par
     \reference[pseudepigraphy]{pseudepigraphy}pseudepigraphy\quad 2\par
     \quad {\em See also} \in[obliteration]
   \stopIndex
   \startIndex{t}
     \reference[TravenB]{Traven, B.}Traven, B.\quad 2
   \stopIndex
   \startIndex{w}
     Weimaraner\quad {\em see under} \in[dogbreeds]
   \stopIndex
   \page
   \placeindex
   \stoptext

--
Rik