https://alvinalexander.com/java/jwarehouse/axis2-1.3/modules/kernel/src/org/apache/axis2/description/DescriptionConstants.java.shtml
Axis 2 - DescriptionConstants.java - operation_key, out_faultflow_key, outflow_key,...
Axis 2 source code file: DescriptionConstants.java (operation_key, out_faultflow_key, outflow_key, service_class_name, string, string)
axisjavaoperationkeyoutflow