Structure Block file format

Structure files are stored as a gzipped NBT file. This file format is used to store structures such as End_city, Igloo and Fossil into the assets/minecraft/structures folder, inside the minecraft.jar. Custom structure can also be saved and loaded using the Structure_Block. These structures are saved into the structures folder of the minecraft map.

NBT Structure
All the specified positions are relative to the block located toward -X, -Y, -Z


 * : The root tag.
 *  (removed in 1.11) : Version of the structure (Currently 1)
 * : Version of the NBT structure.
 * : Name of the player who created this structure
 * : 3 TAG_Int describing the size of the structure
 * : Set of different block state used in the structure.
 * : Block state
 * : Id of the block
 * : List of block state properties, with [name] being the name of the block state property
 * : value of the property
 * : List of individual block in the structure.
 * Individual block
 * : Index of the block state in the palette
 * : 3 TAG_Int describing the position of this block
 * : nbt of the block (optional)
 * : List of entities in the structure
 * : Entity
 * : 3 TAG_Double describing the exact position of the entity
 * : 3 TAG_Int describing the block position of the entity
 * : nbt of the entity (required)