hierarchy

I have an xml document with separators deep down in the hierarchy. <A> <B> <C id='1'/> <separator/> <C id='2'/> </B> <B> <C id='3'/> <separator/> </B> <B> <C id='4'/> </B> </A> I want to move the separators upwards, keeping elements in order. So the desired output is <A> <B> <C id='1'/> </B> </A> <separator/> <A> <B> <C id='2'/> </B> <B> <C id='3'/> </B> </A> <separator/> <A> <B> <C id='4'/> </B> </A> How can it be done using xslt 1.0 only? Can it be done without for-each , using template match only? UPDATE: I actually got 4 brilliant answers of different levels of generality, thank you, guys.

Assuming that we have a set of categories: categories={A,B}. Let's assume more that A consists of subcategories: {A1,A2,A3} and B consists of subcategories: {B1,B2}.In addition, there are even more subcategories as follows: for A1:{A1a,A1b}, for A2:{A2a,A2b}, for A3:{A3a,A3b,A3c}, for B1:{B1a,B1b,B1c}, for B2:{B2a,B2b}. How can I build an hierarchical structure in java? Since the cardinality of each set is fixed and known in advance, my initial approach is to use enum types instead of building classes with inheritance, but I am open to any suggestion. I do not know how to approach this problem

So, I'm experimenting with using rounded-corners in CSS3 (not in IE, don't care if it works there), and I have the DIV where all of my content lives looking quite nice. The problem I'm having is that there are child DIVs that are not getting "masked" by the parent's rounded corners. I'm not looking for the child to inherit the rounded-corners. I just want to have any content inside the parent to not be visible where it is rounded, as if it were masked. I tried using "overflow: hidden;", but that doesn't seem to do the trick. Does anyone have any ideas how the children of the rounded-cornered

Let's say Java has these hierarchical classes: class A { } class B extends A { public void m() { System.out.println("B\n"); } } class C extends B { public void m() { System.out.println("C\n"); } } class D extends C { public static void main(String[] args) { A a = new D(); // a.m(); // doesn't work B b = new D(); b.m(); C c = new D(); c.m(); D d = new D(); d.m(); } } This is the (blind) duplication of the same code in C#: using System; class A { } class B : A { public void M() { Console.WriteLine("B"); } } class C : B { public void M() // I need to use public new void M() to avoid the warning {