Creating a backend Mysql for an xml file

Hi I have a [login to view URL] file with me. It contains the following information 1. Sale price of products 2. Weight of the products 3. Category of the products 4. Postage Charges for the products to different countries which would also differ with weights. There are totally 223 locations or countries for which I have to manually enter the postages rates. For eg: for location1(USA) <range from="0" to="500" carriername="DHL" >23.00</range> <range from="501" to="1000" carriername="DHL" >29.00</range> <range from="1001" to="1500" carriername="DHL" >35.00</range> <range from="1501" to="2000" carriername="DHL" >41.00</range> And this will continue till 1,00,000. All these number are in gms. Depending on the products and place selected by customers, the postage is calculated. Problem: The Problem is that I have to enter all these manually and I have done it. When there is a change in the rates by the carrier agency, the problem arises. I will have to manually modify all the rates for all the 223 countries in the xml file. What I want is to have a backend mysql database for these ranges(weights) and rates, so that whenever there is an increase of 2% or 5% or 10%, I can just change the percent(can be + or -) in the mysql database and these postal charges should get automatically recalculated and appear in the xml file. Sometimes there can be change in rates for only few locations too.I have attached the xml file. Please have a look at it . I want this to be done in 2-3 days time.