XSLT Merge challenge Pt. II

问题:

I have an XML document with 2 Customer Nodes (Current and Updated). I would like to be able to traverse through and produce a resulting XML document to merge the Customer and its various elements (Addresses, Contacts, Accounts, etc.) along with a status at the filed and parent level(s). The solution needs to be able to traverse through n number of child elements which may have n number of children themselves. The format of the input XML is open to change. I can make the Ids attributes if it helps.

Input:

 <Customer Id="Current">
       <CustId>1</CustId>
       <CustName>Acme</CustName>
   <Addresses>
       <Address>
          <AddressId>1</AddressId>
          <Street>111 Main</Street>
      </Address>
      <Address>
          <AddressId>2</AddressId>
          <Street>222 Main</Street>
      </Address>
   <Contacts>
      <Contact>
        <ContactId>1</ContactId>
        <ContactName>Tom</ContactName>
        <ContactPhone>555-1212</ContactPhone>
      </Contact>
   </Contacts>
   </Customer>
     <Customer Id="Updated">
       <CustId>1</CustId>
       <CustName>Acme</CustName>
   <Addresses>
       <Address>
          <AddressId>1</AddressId>
          <Street>111 Main</Street>
      </Address>
      <Address>
          <AddressId>3</AddressId>
          <Street>333 Main</Street>
      </Address>
   <Contacts>
      <Contact>
        <ContactId>1</ContactId>
        <ContactName>Tom</ContactName>
        <ContactPhone>555-1212</ContactPhone>
      </Contact>
   </Contacts>
  </Customer>

Output:

    <Customer Id="Updated" status="Changed">
       <CustId>1</CustId>
       <CustName>Acme</CustName>
       <CustRegion status="New"/>
     <Addresses status="Changed">
       <Address>
          <AddressId>1</AddressId>
          <Street>111 Main</Street>
      </Address>
      <Address Status="Deleted">
          <AddressId>2</AddressId>
          <Street>222 Main</Street>
      </Address>
      <Address Status="New">
          <AddressId status="New">3</AddressId>
          <Street status="New">222 Main</Street>
      </Address>
    <Contacts status="Changed">
      <Contact status="Changed">
        <ContactId>1</ContactId>
        <ContactName>Tom</ContactName>
        <ContactPhone tatus="New">555-1212</ContactPhone>
      </Contact status="New">
   </Contacts>
  </Customer>