I'd just create an alias to the collection and add restrictions.
What I did was to create a criteria query for the parent type, use the return to create a criteria query for the child type, and then add the specific conditions to the child type sub query.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.