important, doubt is how to make sure that functions in the ôòøcpôòù index (say) are formatted with ôòø@ttôòù as opposed to ôòø@rôòù?
The cp index is formatted with the @r font. All other predefined indexes are formatted with the @code font. That information doesn't seem to be captured anywhere. Indexes using @r vs. @tt is part of the definition of Texinfo, just like anything else, so it's not something that would be part of an xml-or-whatever file as far as I can see. In the manual (in case that's what you meant), it's near the end of the (admittedly too long) node Indexing Commands. k