When working with XML, WSDL or XSDs you’ll find yourself struggling really quickly due to a lot of interlinking and namespace references.
Even though it may not work on complex XML files, one trick I’ve learned, to get Linx to understand the file quickly is to remove all namespace references. Once you’ve imported your unreferenced file into Linx, and Linx understands the structure, going forward Linx will be able to read your normal files as well.