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I've found this command:

\setupheadertexts[][{\getmarking[sectionnumber]\ \getmarking[section]}]

to show the current section in the header. But how can I show either the current chapter or the current section in the header depending on the fact the current page already belongs to a section or not?

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up vote 8 down vote accepted

I do not know an elegant solution, but this works ok (thanks to the wiki at contextgarden):

\startsetups testheader
\expanded{\doifsomethingelse{\fetchmark[section][first]}}
  {\getmarking[sectionnumber]\ \getmarking[section]}
  {\getmarking[chapternumber]\ \getmarking[chapter]}
\stopsetups

\setupheadertexts[][\setups{testheader}]
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thanks! Not elegant, but it works great – urso Jun 2 '11 at 15:29

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