code: public static List<Object> getInputOnlyList(Message message, KnowledgeOperation operation, KnowledgeRuntimeEngine runtime) {
          return getInputList(message, operation.getInputOnlyExpressionMappings(), runtime);
      }
docs: Gets an input-only list.
  
  @param message the message
  @param operation the operation
  @param runtime the runtime engine
  @return the input-only list