Your XML schema has a default namespace defined as well as the elementFormDefault parameter set to qualified which means local elements must be namespace qualified when referenced. The webMethods IS import is using explicit prefixes on the elements which conforms to your XML schema.
If you don’t want the elements namespace qualified as defined in your schema, then you should change the schema to not required namespaces on local elements.
#Integration-Server-and-ESB#webMethods#Flow-and-Java-services