adding additional elements to result XML using XSL

Hi xml gurus,

I need some help with xsl, 
I am new to it.

I have an xml document as below 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE SetShipmentProofOfDelivery SYSTEM "XMLDTD\SetShipmentPOD.dtd">
<SetShipmentProofOfDelivery>
	<ShipmentUpdateProgressData>
		<CarrierCode>MIE</CarrierCode>
		<ShipmentNumber>SH-000001022</ShipmentNumber>
		......
		......
		......
	</ShipmentUpdateProgressData>
</SetShipmentProofOfDelivery>


I need to copy all the above and just add 
ShipmentIdType element as below 
I know I need to do something like use Copy of ?? and then 
add this element, but i have never done xsl before !!! so help needed.


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE SetShipmentProofOfDelivery SYSTEM "XMLDTD\SetShipmentPOD.dtd">
<SetShipmentProofOfDelivery>
	<ShipmentUpdateProgressData>
		<CarrierCode>MIE</CarrierCode>
		<ShipmentNumber>SH-000001022</ShipmentNumber>
		......
	 	.......
	</ShipmentUpdateProgressData>
	<ShipmentIdType Value="SI_NUM"/>
</SetShipmentProofOfDelivery>


Thanks for help in advance 
Harsha 


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