I know this is a rather old question but I just wanted to look at the actual XML schema files myself today.
There is an XML Documentation PDF hosted on images-na.ssl-images-amazon.com
which I assume will stay there for a while. This PDF contains links to the core schema files amzn-envelope.xsd, amzn-header.xsd, and amzn-base.xsd and some other API schemas like Product.xsd which all appear to be relative to https://images-na.ssl-images-amazon.com/images/G/01/rainier/help/xsd/release_1_9/
.
The PDF explicitly states that
The XSD samples shown on the Help pages may not reflect the latest XSDs. We recommend
using the provided XSD links to obtain the latest [ve]rsions.
However, the official MWS Feeds API documentation also links to some XSDs but these are relative to https://images-na.ssl-images-amazon.com/images/G/01/rainier/help/xsd/
release_4_1
/
now, e.g. Price.xsd. Schema references also seem to be relative to this path. For example, Price.xsd includes amzn-base.xsd via <xsd:include schemaLocation="amzn-base.xsd"/>
and sure enough there it is.
Unfortunately, I have no idea whether release_4_1
is the latest release of the schemas but the link from the MWS API documentation is a good indicator to me.