Flat -> Hierarchy

Hi,


I think there were some discussion about this topic
already. But my case is a little different from
others. I have a flat structure that need to be
converted into a hierarchy based on another set of
elements that define the relationship between members.


I tried to use recursive and xsl:key methods and it
seems like both of the two methods couldn't solve the
problem.

I am wondering if anyone has an idea on this
particular case. Any help would be very appreciated!


Input:
-----------------------------------------------------
<Members>
		<Member>
			<Label>parent</Label>
			<Description>r1</Description>
		</Member>
		<Member>
			<Label>firstchild</Label>
			<Description>r2</Description>
		</Member>
		<Member>
			<Label>secondchild</Label>
			<Description>r3</Description>
		</Member>
		<Member>
			<Label>firstgrandchild</Label>
			<Description>r3</Description>
		</Member>
</Members>
<hierarchy>
		<node>
			<parent>parent</parent>
			<child>firstchild</child>
		</node>
		<node>
			<parent>parent</parent>
			<child>secondchild</child>
		</node>
		<node>
			<parent>parent</parent>
			<child>secondchild</child>
		</node>
		<node>
			<parent>secondchild</parent>
			<child>firstgrandchild</child>
		</node>
</hierarchy>
------------------------------------------------------

Output:
----------------------------------------------------
<Members>




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