On Thu, 2017-06-22 at 20:03 +0200, Pablo Rodriguez wrote:

Hans,

I have the following sample:

    \def\hola{hola}     \def\MyContent{B \quotation{C} \hola\ D}     \enabledirectives[interaction.identity.preroll]     \setupinteraction[state=start, title={\MyContent}]     \setupinteractionscreen[option=attachment]     \setuppapersize[A5, landscape]     \setuppagenumbering[location=]     \placebookmarks[chapter]     \enabledirectives[references.bookmarks.preroll]     \starttext     \startchapter[title=\MyContent]     \startbuffer[abc]         buffer contents     \stopbuffer     Just an attachment.\attachment[name=buffer.txt, author={Me},     title={\MyContent\ \input knuth}, buffer=abc]

    \setupfield [TextSetup][width=.5\textwidth, height=.5\textwidth,          frame=off]     \definefield [SomeField] [text] [TextSetup] [\MyContent\ \input         knuth]     \field[SomeField]     \stoptext

Would it be possible to have full expansion in PDF widgets? (I mean, the attachment fields and annotation. and the fill-in text field.)

Full expansion doesn't help you here, because \input is protected (i.e. not expandable).  Either use \normalinput or do \expandafter\relax\input knuth  (this however leaves a literal \relax in PDF field). \def\hola{hola} \def\MyContent{B \quotation{C} \hola\ D} \enabledirectives[interaction.identity.preroll] \setupinteraction[state=start, title={\MyContent}] \setupinteractionscreen[option=attachment] \setuppapersize[A5, landscape] \setuppagenumbering[location=] \placebookmarks[chapter] \enabledirectives[references.bookmarks.preroll] \starttext \startchapter[title=\MyContent] \startbuffer[abc]     buffer contents \stopbuffer Just an attachment.\attachment[name=buffer.txt, author={Me}, title={\MyContent\ \input knuth}, buffer=abc] \setupfield   [TextSetup]   [width=.5\textwidth,    height=.5\textwidth,    frame=off] \definefield   [SomeField]   [text]   [TextSetup]   [\MyContent\ \normalinput knuth ] \field[SomeField] \stoptext

Many thanks for your help,

Pablo