[xsl] Tree from a flat list - beginner's question

["TRIFFONOV, Stillian" <Stillian.Triffonov@xxxxxx>]

How can I build the corresponding XML tree from a flat 
element-elementParent list if I do not know
how many levels will I have:

<root>
	<row id=100 parentid=0   name=A/>
	<row id=101 parentid=100 name=A1/>
	<row id=102 parentid=100 name=A2/>
	<row id=103 parentid=101 name=A11/>
	<row id=110 parentid=103 name=A111/>
	<row id=111 parentid=110 name=A1111/>
	<row id=120 parentid=102 name=A21/>
<root/>

Stillian

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