Hi, im playing on 1.12.2 using "modern_ruins". as far as i have understood, it just means that hes changed some of your structures to accommodate for Chisel, so i figured it would be better to ask you directly.
i have been looking at ways to implement variable loot into the structures and saw there was a way to implement the vanilla loot tables. is there a way to implement modded loot tables?

If the modded loot tables have resource URL, you can use them directly. You can also define modded items, but that is tedious.

resource url?
as in file path (sevendaystomine-1.12.2-1.0.2.10\assets\sevendaystomine\loot_tables\airdrop.json) or something else more complicated?

the specific thing i want right now, is to make this:
rule11=0,100,IInventory;sevendaystomine:bookshelf;minecraft:book#1#0#1+minecraft:book#1#0#2+minecraft:book#1#0#3+minecraft:book#1#0#4+minecraft:book#1#0#7+minecraft:book#1#0#8-0

refer to 7dtm's loot table for "bookshelf_common"
sevendaystomine-1.12.2-1.0.2.10\assets\sevendaystomine\loot_tables\bookshelf_common
bookshelf_common.json

I googled his github, his source is public, and found the thing you refer to: https://github.com/Nuparu00/7-Days-to-Mine-Mod/blob/1.20.1/src/main/java/nuparu/sevendaystomine/world/level/levelgen/processor/BookshelfProcessor.java#L15

The correct resource URL are
sevendaystomine:containers/bookshelf/bookshelf_common
sevendaystomine:containers/bookshelf/bookshelf_rare

thank you for your help :)

Note thats 1.20.1, there is a small chance the ID was different in 1.12.2, he has a branch for that, if those dont work you can check it out and do some searching

Given the matching folder structure, and the files here in 1.12: https://github.com/Nuparu00/7-Days-to-Mine-Mod/tree/1.12.2/Forge%201.12.2/src/main/resources/assets/sevendaystomine/loot_tables

i would expect the URL to be
sevendaystomine:bookshelf_common
sevendaystomine:bookshelf_rare