Constructing hierarchical XML from a flat XML-tag sequ

Hello!

I want to be able to convert XML code like

<XMLCODE>
<a/><b/><c/><d/><a/><b/><c/><d/><a/><b/><c/><d/><a/><b/><c/><d/>
</XMLCODE>

to the following XML:

<NEWXMLCODE>
<a>
	<b/>
	<c/>
	<d/>
</a>
<a>
	<b/>
	<c/>
	<d/>
</a>
<a>
	<b/>
	<c/>
	<d/>
</a>
</NEWXMLCODE>

The DTD for the input XML is:	<!ELEMENT XMLCODE (a | b | c | d)+>
				a, b, c, d are empty tags

The DTD for the output XML is:	<!ELEMENT NEWXMLCODE (a+)>
                                                <!ELEMENT a (b | c | d)*>
				b, c, d are empty tags

Can this be done? and how? 
I just can't figure it out!

/Lars Eskildsen



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