如何将复杂对象的ArrayList存储到xml中？

I have two classes which are having relations with each other as below. I have a list of ObjReal objects where the whole data is presented. I want to save the whole List into xml without losing the object relationships. I mean an object represented in XML should have their corresponding objStrucs along with it. To store ObjReal into xml is straight forward but i am getting confused with its ObjStruc relations. Please helpe to solve this problem.I have two classes which are having relations w