Any hierarchical Data Support in Doctrine 2? -

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In principle 1, I think it supports sequential data support? Is there anybody in principle 2?

UPDATE 1

OK, so I used to experiment. I have some questions

insert one node 

  // $ 1 in the document; new1 (new) square; $ Child 1- & gt; Name = 'child category 1'; $ Child2 = new square (); $ Child2- & gt; Name = 'child category 2'; $ Range & gt; AddChild ($ child1); $ Range & gt; AddChild ($ child2); It seems to me that  
  $ root = $ nsm-> Make something like Root ($ category); $ Root- & gt; AddChild ($ child1); $ Root- & gt; AddChild ($ child2);  
 
 Similarly, to add sub children 
 
  $ child2wrapper = $ root- & gt; Add Chald ($ child2); $ Child2wrapper- & gt; AddChild ($ newChild);  
 
  There are more trees except 2 root areas.  
 
 Say I want many trees, I see that the extension does not populate my  root  field?

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