How to create a page reference to another separate document in ConTeXt?

Question

My question is similar to this, but for ConTeXt.

I have multiple documents, that are to be bundled as a set (e.g. textbook, workbook, teachers' guide). I frequently need to make a cross-reference to another item, e.g. the workbook might say "Refer to Article 3 on p. 1 of the textbook."

Is there a way to make such cross-references? s Hyperlinking is not needed.

Answer 1

You can do that with \useexternaldocument as described in the wiki:

% textbook.tex

\starttext

\startchapter[title=Knuth,reference=knuth]
  \input knuth
\stopchapter

\stoptext

% workbook.tex

\setupinteraction
  [state=start]

\useexternaldocument
  [tb][textbook][Textbook]

\setupinteraction
  [state=start,
   color=darkgreen]

\starttext

See Knuth on \at{page}[tb::knuth] of the \from[tb].

\stoptext