Actually in the context of references, not only parentheses as Wolfgang pointed out, but also some words are reserved, such as nextpage and previous page:

\setupinteraction[state=start]

\starttext

\goto{Second page}[page(2)]

\goto{Go to next page}[nextpage]

\page

\goto{ConTeXt garden}[url(http://wiki.contextgarden.net)]

\goto{Go to previous page}[previouspage]

\stoptext

Best regards: OK

On 11 Jul 2019, at 11:03, Peter Rolf <indiego@gmx.net> wrote:

Am 10.07.2019 um 21:29 schrieb Wolfgang Schuster:
Sanjoy Mahajan schrieb am 10.07.2019 um 04:15:
Dear List,

Warning: The following may be a bug or feature or just my
misunderstanding!  It seems that parentheses cause trouble in
references.
Braces are used for the argument of reference actions.

\setupinteraction[state=start]

\starttext

\goto{Second page}[page(2)]

\page

\goto{ConTeXt garden}[url(http://wiki.contextgarden.net)]

\stoptext

Wolfgang


I see. Thanks for clearifying.


Peter
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