为什么XSD。EXE创建两个.XSD文件，以及如何使用它们?

I am using the following command to generate related xsd file from my input XML file -- response.xml, my confusion is (1) why there are two xsd file output (response.xsd and response_app1.xsd), I think there should be only one of them generated? (2) If I need to generate C# class file by using xsd /classes, which xsd file should I use?I am using the following command to generate re