How to create varying number of tree hierarchies

Question

I have a db table with recursive tree structure established through id and parentId columns. There can be n first level parents(records with parentId=null); below data shows two first level parents(A and X).
Name Id ParentId
A 1 null
B 2 1
C 3 2
X 4 null
Y 5 4
Z 6 5
The requirement is to create ADF UI with n number of tree tables for these n first level parents with all their children. In the above example it should create 2 tree tables(A and it's children and X and it's children in separate tree tables).
TreeTable - A
A
-->B
----->C
TreeTable - X
X
-->Y
----->Z
I am able to create a single tree table as below using self referencing viewlinks as explained here http://docs.oracle.com/cd/E17904_01/web.1111/b31974/web_masterdetail.htm#BJEFHDIJ
TreeTable
A
-->B
----->C
X
-->Y
----->Z
I tried to put an af:forEach around the tree table making it point to bindings.<firstlevelparentsVO>.rangeset and it prints two tables but both have hierarchy for both A and X
I also tried making the firstlevelparentsVO a child of another VO which also would essentially return the first level parents and linking them through viewlink hoping af:forEach when prints will evaluate children only for a specific first level parent but there it printed 2 tree tables but both has only the hierarchy for the first first level parent(A) only. If there is an explicit navigation to X in the parent VO then both treetables will show the tree for X.
I appreciate any suggestion to achieve this requirement.

Answer 1

Frank,
Thank you for the response.
On the page2 of the pdf link you provided there is a picture of the tree table and it shows the hierarchy of the first level(or root) parent (President, Steven King). If the data had n presidents (n first or root level ) then this will dispaly all data in the same tree table like
King
--Kochhar
----Greenberge
King 2
--report 1
----report 1.1
King n
--report n
----report n.1
My requirement is pretty close to this but slighly different where these n first level should appear in n different tree tables like below:
Treetable for: King
King
--Kochhar
----Greenberge
Treetable for: King 2
King 2
--report 1
----report 1.1
Treetable for: King n
King n
--report n
----report n.1
That is the reason why I am playing with af:forEach and also have a separate VO which returns all the presidents(first level parents) and view linked that to EmployeesVO so that the AM looks like
AllPresidentsVO
-----EmployeesVO (with the view criteria wihch returns the first level parents)
---------reportingManagers
forEach prints n instances for PresidentsVO King, King2.. King n but all these instances have the same children the tree for King (tree for King2 ... King n does not appear)
May be it should be achieved in a different way?