[NTG-context] Use section custom value in a header text.

[Henning Hraban Ramm]

Am 20.12.22 um 20:31 schrieb Pawel Urbanski via ntg-context:
> Hi,
> Let me clarify my question more...
> I need to attach some value to a chapter in that key. That custom 
> prefix + the value in the key is ment to be in the header or a footer as 
> a matter of fact. The case can apply to both headers and footers.
> I tried:
> \chapter[title={A sample title}][custom_random={custom_value}]
> \setupheadertexts[{Prefix: \structureuservariable{custom_random}}]
> ...
> \stopchapter
> I tried this code when trying to figure out the mechanism. The prefix 
> string in placed in the header, but hte custom value of the attached key 
> is not expanded..
> Evey page will contain just one section started by a \startchapter and 
> \stop chapter. I would like to put this custom attached value in the 
> right slot in the document header.

In headers and footers, you need 
\namedstructureuservariable{chapter}{custom_value} and maybe some 
expansion stuff (not my forte).

Hraban