oscommerce xml feed

I have never worked with oscommerce before, but the custom I have worked with prveiously (on Wordpress and pure PHP) is asking me to add XML feed to his oscommerce website.

Can you, please, guid me:1) is there any existing plugin/module to use?or2) should I do xml feed by myself?

I need website to take date from the follwong xmls:http://www.atsdistribution.co.uk/feeds/Xml_All_Products.aspxandhttp://www.atsdistribution.co.uk/feeds/Xml_All_Stock.aspx

and to update prodcuts automatically.

I was looking into google and I havenot found the sollution for this.