[xsl] Comparing multiple dates to display the most recent

["Katie McNally" <kmcnally9 at hotmail dot com>]

For the XML included below, I would like to display one value for the 
Mortage date (RequestType = MORTGAGE).

For the example xml below I want to display:
Mortgage Request Date: 12/23/2001

Multiple Mortgage dates can be returned in the xml, but only the most recent 
should be displayed.  If I don't know the number of dates returned (of type 
MORTGAGE) ahead of time, how do I determine which date is the most recent 
and then display it?

XML:

<Loan>
  <RequestSet>
    <Request>
  	<DateRequested>03-Dec-2001 16:55:23</DateRequested>
  	<RequestType>MORTGAGE</RequestType>
    </Request>
    <Request>
	 <DateRequested>06-Dec-2001 14:33:00</DateRequested>
  	<RequestType>FLOOD</RequestType>
    </Request>
    <Request>
	 <DateRequested>07-Dec-2001 11:38:00</DateRequested>
  	<RequestType>MORTGAGE</RequestType>
    </Request>
    <Request>
	 <DateRequested>23-Dec-2001 13:18:00</DateRequested>
  	<RequestType>MORTGAGE</RequestType>
    </Request>
    <Request>
	 <DateRequested>04-Dec-2001 12:31:00</DateRequested>
  	<RequestType>HAZARD</RequestType>
    </Request>
  </RequestSet>
</Loan>


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