Building XCBL30 Document Set

Im confused on how to create a whole document set in webMethods. I went to [URL=“Welcome to xCBL.org”]http://www.xcbl.org/xcbl30/xcbl30.shtml[/URL] and downloaded the schemas for the different document types. When I look in the zip fril they are .SOX and .MOD files? What do I do with these? I want to be able to just import each document. Thanks.