I haven't heard of UDC, and it seems interesting. Thanks for sharing. Can you provide a fuller example of the classification system in action for your library?
Sorry for the late response. It took awhile to get things together. UDC is based off of Dewey, but makes subtle/essential changes for a modern library. I think the latest edition is the 23rd or maybe 24th. It consists of two heavy volumes of microscopic text on gigantic pages, a thousand of them per book (or more). You can download both off of Libgen, they're maybe 100 megs each? I forget. They now encourage you to use their web app, which is $300/year for a single seat.
They have a seven day trial. About 8 years ago, I used it... and monkey-patched the javascript function downloading each new xhr, and had it save those to a file. Then I modified that function to just load the local file instead of downloading (each uniquely named). But I still had to click the "next page" button, and I apparently missed a few back then, so you'll be clicking along trying to find something and just get the big Firefox error page in the iframe.
A couple of weeks ago, I got another seven day trial with a different email, and carefully downloaded every single paginated data file. Spent the whole week figuring out how to do it, barely verified I had it all before it expired. Instead of the data just being more html pages that load into an iframe, I parsed them all to json, took a week to clean it and make adjustments. And, though it's not quite working right this second, I can now implement the search feature and a few fancier things. All the code/style is in a single file (just load it into a tab), but the data's still somewhat big (11 megs for the listings), so I have that in an external file (three, really) rather than inline. Bet you didn't know someone could pirate web apps?
https://mega.nz/folder/7JsjFKxZ#5IQBmojjGvXVspE4-bwh7Q
I have the old one in there for comparison, in case anyone wants to see it. I will continue to update the new one as I have time.
As for how I use this, it's not that crazy or complicated.
For me, it's just a guide on what to name folders. Where UDC nests these too deeply, I try to flatten a bit. I try to have a convention of file naming, I basically do
title - identifiers - author list.