使用非默认源目录在GWT中定义模块

Let's say that I want to define a module "Pair" in com.mycompany.common such that the source is located in com.mycompany.common (and not com.mycompany.common.client). How would I do this? Alternatively, let's say that I have the flexibility of defining the module "Pair" in com.mycompany instead while still having the source in com.mycompany.common.Let's say that I want to define a module "Pair"