Koha allows to add filters that massage the Marc record before it is passed on to the processing routines. The relevant section in C4::XLST.pm reads ```perl my $record_processor = Koha::RecordProcessor->new( { filters => ['ExpandCodedFields'], options => { interface => $interface, frameworkcode => $frameworkcode } } ); ``` Unfortunately, there seems easily accessible way to extend the `filters` array so it is currently not possible to eg. hook up a plugin to add a filter in this position. To help proceeding on bugs 21303, 30018, 37296, 37325 it would be helpful to have a hook here so development of the automatic punctuation could first be done as a plugin.
Off the top of my head, I might be a bit worried about this from a performance perspective, but it's interesting.