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graph - Coggle Diagram

- - - - nodes
    - - edges (pair of the nodes)
    - - :no_entry: removing more difficult, because all child node should removed
      - :no_entry: selection is bad. also can choose all direct descendants of item
      - :check: it`s ez to add and update elem. (just data id and perent id)
  - - - :no_entry: add and update are so costly procedures (recalculating of borders and ID)
      - :no_entry: removing is extremely costly, too (recalculating of borders and ID)
      - :check: selection is a highlight of this model
  - - - :check::!?: Descend. of deleted item - indirect descendants of the parent
      - :check: selection is a highlight of this model
      - :no_entry: add and update more difficult than adjacency. (parent path and than add id to id)