Grails：使用XML数据绑定保存嵌套对象

I'm creating a REST service in Grails to accept data from a python script. The python script generates an XML representation of the object graph and submits it to the controller. Things work great for my flat objects, but I can't figure out how to handle the case where a domain object contains a Set of children objects. For unrelated reasons, my DOA layer is pure Java JPA.I'm creating a REST service in Grails to accept