AbleCommerce Shopping Cart Software

How do I determine which xml values are absolutely required? Is there an xml schema or documentation that indicates this?

-Joshua

Hello, I have purchased AbleCommerce 7.0. I need to migrate customer data from my existing cart software to AC. I looked at the Data Port utility. It described the format for importing "user" information (as far as I can tell, user = customer), but it was unclear how to import the users address info...