验证由c＃web服务作为参数接收的Delphi中的XML Schema

I have a C# Web Service that returns a XML as a result that will be consumed by a Delphi 7 application. Normally, I would return a .Net XmlDocument class if I had a .Net client, but, for Delphi, I'm returning a string. Below is the C# Web Service Code:I have a C# Web Service that returns a XML as a