Minecraft wiki entry for Flattening, associated text: 1 Block and item IDs
2 Entity IDs
3 Biome IDs
4 Particle IDs
5 Sound events
6 Block states
7 Painting motifs
8 Names
9 Statistics
10 NBT data
10.1 Items
10.2 Entities
10.3 Blocks
10.3.1 Prior specifications
11 Commands
12 Advancements
13 Loot tables
14 Game assets
14.1 Block translation strings
14.2 Item translation strings
15 History
16 References