Lady, EVOLVED 
https://git.ladys.computer/Caudex if you want to see the hard way of doing things before i finish up work on the easy way of doing things
basically i am leveraging the “expanded archive” functionality from ⛩📰 书社 to take this down to a single .xslt file, which really makes one wonder whether this needs a whole dedicated git repository, although i probably will keep it for the `make +category` functionality which is convenient and nontrivial
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allllll of the “catalog”-related stuff in that makefile is going to be dropped, tho, and possibly also the subrepo approach in favour of expecting users to stich things together in the downstream repo
“just define a conceptual tarball and expand it” feels kludgy but solves like 95% of the situations where multiple files need to be produced from a single source file, more elegantly than anything else i’ve been able to come up with