Customise XML Real Estate Import Script

PHP coder required to alter XML import script so that the script imports external feed data & changes 3 fields of the external feed data to match the data requirements of our DB. The XML import script is similar to the MLS system used for USA real estate listings. ***Please only bid/reply if you have an understanding of the MLS real estate system, importing data from external feeds and have a contactable telephone number so that I can talk to you direct about the customisation if needs be.