According to http://wiki.contextgarden.net/Registers#Processors, processors are
the MkIV way of highlighting within index entries.
If there are highlighted and not-highlighted entries, the normal version wins.
If there is a highlighted version with subentry, the subentry becomes
highlighted and is sorted unter the normal main entry, if there doesn’t exist a
normal entry with the same subentry.
(These are just observations, I wouldn’t know how it should be different.)
But: Is there a way to highlight just subentries?
e.g. \index{Sun+emph->rays}
"""
\defineprocessor[emph][style=italic]
\starttext
\index{Sun}
\index{Sun->rays}
\index{emph->Sun}
\index{Sun+emph->rays} % doesn’t work
\index{emph->Sun+rays} % rays upright
\index{emph->Sun+beams} % beams italic
\placeindex[n=1]
\stoptext
"""
Greetlings, Hraban
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