recursion

I have an XML structure like that:
 
<row ItemID="1" iParentID="0" szSubject="Msg1"/>
 
<row ItemID="2" iParentID="1" szSubject="Msg2"/>
 
<row ItemID="3" iParentID="2" szSubject="Msg3"/>
 
<row ItemID="4" iParentID="1" szSubject="Msg4"/>
 
<row ItemID="5" iParentID="4" szSubject="Msg4"/>
 
And I want an XSLT transformation to get this data in a hierarchical tree
like that:
 
1
    2
        3
4
    5
 
Can you help me?
 
Thanks in advance....


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