See block_format.md for more information on data types.

• Header

  • Raw bytes corresponding to "FEATHER_ITEM_DATA_FILE" in ASCII

• Protocol ID mappings

  • Array of struct
    • if native_mappings:
      • String name of this item, e.g. "minecraft:iron_sword"
      • Protocol ID (i32)
    • else:
      • Native ID for this item (i32)
      • Protocol ID of this item for this version (i32)