XDTOFactory is designed to replace 1C:Script in import/export code with setting up XDTO objects in Designer mode or any other XSD-editor. If you have lots of complicated objects having many attributes, tabular sections and relations between each other, the 1C:Script will become too complicated to design and support.
P.S.: note, that you can import XSD in Designer, so try to get it from the software which you integrate with and then go to Common -> XDTO packages, right click on it and choose Import XML Schema.