I am exploring the feasibility of presenting two interacting PDF files side
by side. Thus far my experiments with \usereferences have managed only to
produce a lua error:
.../ConTeXt/tex/texmf-context/tex/context/base/strc-ref.lua:1394: attempt
to call field 'reference' (a nil value)
stack traceback:
.../ConTeXt/tex/texmf-context/tex/context/base/strc-ref.lua:1394: in
function 'identify_outer'
.../ConTeXt/tex/texmf-context/tex/context/base/strc-ref.lua:1620: in
function 'identify'
.../ConTeXt/tex/texmf-context/tex/context/base/strc-ref.lua:1645: in
function 'valid'
.../ConTeXt/tex/texmf-context/tex/context/base/strc-ref.lua:1667: in
function 'doifelsereference'
[\directlua]:1: in main chunk
The setup--
%testA.tex
\starttext
text text.\reference[firstpage]{}
text text.\footnote[fnote]{A note.}
\stoptext
%LinkTest.tex
\setupinteraction[state=start]
\useexternaldocument[testA.tex]
\usereferences[testA.tex]
\starttext
\at{page}[testA.tex::firstpage]
\in{note}[testA.tex::fnote]
\stoptext
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