[xsl] Fwd: Flat XML File to Hierarchical ... best approach?

["Mary McRae" <fiberartisan@xxxxxxxxx>]

First, I've been to the FAQ site and read each of the entries of Flat
File to Hierarchical. I didn't find anything that quite addressed my
problem.

My source data is flat but properly sequenced. There are two elements
whose values, if identical, imply parent/child relationship --
DocumentItemID and ParentID.

Input XML:
<Items>
<Item> (should correspond to Items/Item)
 <DocumentItemID>aaaaa</DocumentItemID>
 <ParentID>0000</ParentID>
 ...
</Item>
<Note> (should correspond to Items/Item/Note)
 <DocumentItemID>11111</DocumentItemID>
 <ParentID>aaaaa</ParentID>
 ...
</Note>
<Item> (should correspond to Items/Item/Item)
 <DocumentItemID>bbbbb</DocumentItemID>
 <ParentID>aaaaa</ParentID>
 ...
</Item>
<Item> (should correspond to Items/Item/Item/Item)
 <DocumentItemID>ccccc</DocumentItemID>
 <ParentID>bbbbb</ParentID>
 ...
</Item>

Output XML:
<Item1>
 <DocumentItemID>aaaaa</DocumentItemID>
 <ParentID>0000</ParentID>
 ...
 <Note>
   <DocumentItemID>11111</DocumentItemID>
   <ParentID>aaaaa</ParentID>
   ...
 </Note>
 <Item2>
   <DocumentItemID>bbbbb</DocumentItemID>
   <ParentID>aaaaa</ParentID>
   ...
   <Item3>
     <DocumentItemID>ccccc</DocumentItemID>
     <ParentID>bbbbb</ParentID>
     ...
   </Item3>
 </Item2>
</Item1>
</Items>

There can be as many as 8 levels of Item. There are 4 other elements
that are similar to Note and must always be a child of an Item(1-8)
element. My thought was that I could capture the Item/DocumentItemID
each time I encounter an Item element, and then each time I encounter
a Note or other child element of Item compare its child ParentID to
the Item/DocumentID and if they match output the child elements ...

I keep either suppressing output of everything but the Item elements
or repeating the Note elements in each instance of an Item element ...

Can someone point me in the right direction?

Thanks!

Judy