]
\definehead
[summary]
[subsubsubsubject]
\setuphead
[summary]
[style=,
deeptextcommand=\boldtype,
command=\MySummaryHead,
color=blue]
\startsummary[title={bla \relax}]
\stopsummary
In the proces I figured out that in mkiv the argument was not passed
expanded so that's
[subject][incrementnumber=list]
\setuphead[subsubject][incrementnumber=list]
\setuphead[subsubsubject][incrementnumber=list]
\setuphead[subsubsubsubject][incrementnumber=list]
\setupheads[sectionstopper=.]
\definecombinedlist
[content]
[part,
chapter,
section,
subsection
defined [subsubject]
system : mark subsubjectnumber defined [subsubjectnumber]
system : mark subsubsubject defined [subsubsubject]
system : mark subsubsubjectnumber defined [subsubsubjectnumber]
system : mark subsubsubsubject defined [subsubsubsubject]
system : mark subsubsubsubjectnumber defined
[subsubsubject]
system : mark subsubsubjectnumber defined [subsubsubjectnumber]
system : mark subsubsubsubject defined [subsubsubsubject]
system : mark subsubsubsubjectnumber defined
[subsubsubsubjectnumber]
system : mark subsubsubsubsubject defined
subsubsubjectnumber defined [subsubsubjectnumber]
system : mark subsubsubsubject defined [subsubsubsubject]
system : mark subsubsubsubjectnumber defined
[subsubsubsubjectnumber]
system : mark subsubsubsubsubject defined [subsubsubsubsubject]
system : mark
: mark subsubsubsubject defined [subsubsubsubject]
system : mark subsubsubsubjectnumber defined
[subsubsubsubjectnumber]
system : mark subsubsubsubsubject defined [subsubsubsubsubject]
system : mark subsubsubsubsubjectnumber defined
[subsubsubsubsubjectnu
mber
defined [subsubsubjectnumber]
system : mark subsubsubsubject defined [subsubsubsubject]
system : mark subsubsubsubjectnumber defined [subsubsubsubjectnumber]
system : mark subsubsubsubsubject defined [subsubsubsubsubject]
system : mark subsubsubsubsubjectnumber