Code generators are part of developers everyday life. Even if you don't realize it then read the following text and artical:
A freeware template-based code generator that can generate code for any ASCII-based language. CodeSmith templates use a syntax nearly identical to ASP.NET and it may contain scripting code in C#, VB, or JScript. When you use CodeSmith to generate code, the CodeSmith engine combines static content in the template with dynamic metadata that can be supplied in a variety of formats. In particular, CodeSmith can make use of an XML file as a metadata source for a template. This allows you to supply the dynamic part of your generated code in the form of an XML file that gets read and processed by the CodeSmith engine.
You can get a good artical about using it in the real world.