TagManager

Tags group blocks and items under a shared name, and the newer format is what most later Minecraft versions use. TagManager brings that system to 1.12.2 by loading tag data that follows the same structure, with entries that can name an exact metadata value, such as minecraft:planks:2 for birch planks. Entries can also be marked optional, so a tag still loads when an entry is missing. Many entries use the id values that existed before the flattening change, which is why the older names appear in the data files.

The mod also includes Tables, a second kind of data file. A table lists a property and maps one block to another block, or one integer to another integer, with a key and a value for each pair. Tables can convert a block in the world, which is useful for swapping variants, and enchantment power levels or ore values can be expressed the same way. The mod ships some original tags, such as tagmanager:tin ores, as examples. Tag and table files are reloaded without restarting the game outside a development environment, so changes take effect on the next reload. TagManager has no effect on its own; it needs data packs or other mods that use tags to make a difference.