I have the same trouble. Amazon unlike Google has given the xsd and not the xml. Amazon gives its client library. but the data that we need to put in the XML will be scattered in many tables and sql joins and groups makes the query slow and the code will not even execute properly.
I downloaded XMLSpy 30 day trial version which is of 95MB and loaded all the xsd and generated the test XML for Home and Kitchen category Try it out and post any issues you are facing.