Unable to generate json schema

I am brand new to using the schema compiler, and not very familiar with the xml schema notation. I ran the shiporder example, and got the expected results. I am trying to convert a large complex xml schema that uses the building block below.

Running the compiler using the command line below did not generate any files. Any guidance you can provide would be much appreciated.

Thanks. Peter

java -jar ./jsonix-schema-compiler-full-2.3.9.jar -generateJsonSchema -d mappings -logLevel DEBUG xml_test.xsd