Structures file must be placed in ./Structory/structures/ In a single file you can define more structures.

Structures must have a key and a name. No need to worry about the key since it is used the main node where you define a new structure.

Parameter	Type	Description	Required	Default
name	String	Structure’s display name	true	*
check-block	Material	Block to check to activate the structure	false	null
orientation	Boolean	If the structure is symmetric or not, if true, there will be a check along each direction (NORTH, SOUTH, EAST, WEST)	false	false
options	Options	Options values, check Options.	false	empty
layout	Layout	Layout values, check Layout.	false	empty

As you can see, only the name parameter is mandatory

Example file of a structure.

elder_altar:
  name: "Elder Altar"
  check-block: CAULDRON
  orientation: false #check only EAST orientation, perfect if the structure is symmetric
  options:
    notify:
      message: "<white>You have created <light_purple>%structure%"
      actionbar: "<white>Now you can craft <light_purple>serious<white> items"
    crafting:
      insert:
        sound:
          type: BLOCK_BREWING_STAND_BREW
          volume: 10
          pitch: 1
      place:
        sound:
          type: ENTITY_ITEM_FRAME_PLACE
          volume: 10
          pitch: 3
      take:
        sound:
          type: ENTITY_ITEM_FRAME_REMOVE_ITEM
          volume: 10
          pitch: 3
      consume:
        particle:
          type: FLAME
          particle: SOUL_FIRE_FLAME
          amount: 10
          count: 1
          center-offset: "0 0 0"
          speed: 0
        sound:
          type: ENTITY_BLAZE_SHOOT
          volume: 1
          pitch: 0
      result:
        particle:
          type: FLAME
          particle: SOUL_FIRE_FLAME
          amount: 10
          count: 1
          center-offset: "0.0 0.5 0.0"
          speed: 0.1
        sound:
          type: ENTITY_DRAGON_FIREBALL_EXPLODE
          volume: 10
          pitch: 85
    particle:
      type: BOXSIZED
      amount: 15
      particle: PORTAL
      count: 1
      speed: 0.5
      center-offset: "0 1 0"
      start-point-offset: "-2.5 -0.6 -2.5"
      end-point-offset: "2.5 0.5 2.5"
    fireworks:
      type: RANDOM
      amount: 5
      power: 5
      flicker: true
      fade: PURPLE, BLACK, SILVER
      colors: FUCHSIA, PURPLE, WHITE, BLACK
  layout:
    recipe-slots:
      offsets: #slots are ordered from up (first) to bottom (last)
        - "-3 0.0 0"
        - "-2 0.0 2"
        - "-2 0.0 -2"
        - "2 0.0 -2"
        - "2 0.0 2"
        - "0 0.0 3"
        - "0.0 0.0 -3"
        - "3 0.0 0.0"
    levels:
      level0:
        level: 0
        type: STANDARD
        checkers:
          types:
            X: BLACKSTONE_WALL
            C: CAULDRON
          main:
            - "***X***"
            - "*X***X*"
            - "*******"
            - "X**C**X"
            - "*******"
            - "*X***X*"
            - "***X***"
      level-1:
        level: -1
        type: STANDARD
        checkers:
          types:
            C: CRYING_OBSIDIAN
            E: END_STONE
            O: OBSIDIAN
          main:
            - "***C***"
            - "*CEEEC*"
            - "*EOEOE*"
            - "CEECEEC"
            - "*EOEOE*"
            - "*CEEEC*"
            - "***C***"