> Otared Kavian <mailto:otared@gmail.com>
> 5. November 2016 um 18:34
> Hi Wolfgang, Hi Mikael,
>
> Thank you both for your great inputs!
>
> I tried to modify the code each of you sent yesterday in order to « 
> couple » automatically each question with its answer, using the 
> keyword « coupling=… », but somehow I am unable to create automatic 
> references by extracting the number of each question or that of each 
> answer, for example by using \rawcountervalue,
> or \currentconstructionnumber. Strangely the latter gives the name of 
> the construction and not a number: is it on purpose?
The \currentconstructionnumber command contains the name of the counter 
but getting the counter value won’t help because it comes too late.
> The solution Wolfgang proposes today, using the new keyword 
> referenceprefix, is almost perfect: however would it possible to 
> create a version of
> « currentconstructionreference » which creates a reference named for 
> instance
> answer:NumberOfCurentConstruction
The referenceprefix key is only usefull when you set the reference by hand.
> The reason for which I need such a construction is that in a document 
> with hundreds or more exercise —> hint —> solution, it would be handy 
> to avoid creating each time a manual reference, and then one would 
> navigate from a Question to its Hint and then  back to the Question or 
> go to its Answer.
When you always all three elements (question, hint and answer) you can 
increment
a counter at the begin of each element and create a page reference which 
contains
the value of the counter.

Below is a modified version of my previous example for this method.

%%%% begin example
\setupinteraction[state=start]

\define[1]\QuestionTextCommand
   {\doglobal\increment\QuestionCounter
    \pagereference[question:\QuestionCounter]%
    \doifreferencefoundelse{answer:\QuestionCounter}
      {\goto{#1}[answer:\QuestionCounter]}
      {#1}}

\define[1]\AnswerTextCommand
   {\doglobal\increment\AnswerCounter
    \pagereference[answer:\AnswerCounter]%
    \doifreferencefoundelse{question:\AnswerCounter}
      {\goto{#1}[question:\AnswerCounter]}
      {#1}}

\defineenumeration
   [question]
   [text=Question,
    headcommand=\QuestionTextCommand]

\defineenumeration
   [answer]
   [text=Answer,
    headcommand=\AnswerTextCommand]

\defineblock[answer]

\startbuffer
     %
     \startquestion
     \input knuth
     \stopquestion
     %
     \beginanswer
         \startanswer
         \input knuth
         \stopanswer
     \endanswer
     %
\stopbuffer

\starttext

\dorecurse{10}{\getbuffer}

\page

\useblocks[answer]

\stoptext
%%%% end example

Wolfgang