[xsl] weed out unused global reference in an xsd document

[Tim Müller-Seydlitz <tms@xxxxxxxxxxxxxxxxxx>]

Hi,
I want to work on a xsd document. Where I want to weed out the global 
elements that are not referenced to anymore.
How could I do it with xslt?
Let me be a bit more specific. From a file that looks like this

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.you-know-who.com/2003/"; 
xmlns="http://www.you-know-who.com/2003/"; 
xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"; 
xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
elementFormDefault="qualified" attributeFormDefault="unqualified">
   <xs:complexType name="Account">
       <xs:sequence>
           <xs:element ref="bankCode" minOccurs="0"/>
           <xs:element ref="branchNumber" minOccurs="0"/>
           <xs:element ref="accountNumber" minOccurs="0"/>
       </xs:sequence>
   </xs:complexType>
   <xs:element name="account" type="Account">
   </xs:element>
   <xs:element name="accountNumber" type="xs:string">
   </xs:element>
   <xs:element name="bankCode" type="xs:string"/>
   <xs:element name="branchNumber" type="xs:string">
   </xs:element>
   <xs:element name="currency" type="xs:string" />
</xs:schema>

I want that     <xs:element name="currency" type="xs:string" /> and all 
other unused references in a larger document  do not appear in the 
output anymore.
Apart from that the xsd shall remain unchanged
Regards for your help.
Tim





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