UI-create
...

(ZIP still intact)

2 UI-close
  2.1 connection.flush
    2.1.1 "database".commit
        2.1.1.1 "root".commit
        2.1.1.2 "root".commit

(ZIP still intact)

3 connection.dispose
  3.1 "root".commit

(ZIP still intact)

4 doc.dispose
  4.1 "database".commit
      4.1.1 "root".commit
      (ZIP corrupted!)
      4.1.2 "root".commit
  4.2 "root".commit