XML-RPC - Building a catalog from an external XMLDataStream

[eluser]ModernM[/eluser]
Well after a day of fiddling with the XML RPC I have read that the format of the post and get structure of the XML is very tight and not flexible. I am able to knock on the door so to speak with the xML rPC but i need to send specific information to the service(datastream) in order to get back a responses.

Here is where I am at.
http://screen.modernmgrp.com/catalog/cat

Hopefully someone can help me out here, i think I need to come at this another direction but I have no idea where to start. According to the dev manual for the data feed I need to POST the data shown in the XML format they provide. I havent worked with XML and PHP enough to send it anywhere so I am a bit stuck.

Hopefully someone can shed some light on this for me. Give a man a fish feed him for a day, teach a man to fish feed him for life. I am learning to fish I know, just need to know what bait to use and what pole, and I think I can sort out the rest slowly.