Mapping of interconnection with nhibernate

Question

I have to describe interconnection between objects.

public class Entity
{
    public string Name {get;set;}
    public IList<Entity> Connections {get;set;}
}

How can i persist this?

I add another layer of complexity: querying on a specific date a connection between two entities can't be already defined. So probably I need a support table that contain a structure like Id, Source, Destination, ValidFrom, ValidUntil

Mauro