Explanation for parentId Field

Use the following assembly tree as an example:

The following Field values are applicable:

Class name Field value for id Field value for parentId
AssemblyExample 13 NULL
Folder 1 14 13
Leaf 1 15 14
New Document A 16 15
New Document B 17 15
New Document C 18 15
New Document D 19 15
Folder 2 20 13
Leaf 2 21 20
Leaf 3 22 20
Leaf 4 23 20
Folder 3 24 13
Folder 4 25 13