/**
	 * Used internally to iterate over the installed EditPolicies. While
	 * EditPolicy slots may be reserved with <code>null</code>, the iterator
	 * only returns the non-null ones.
	 * 
	 * @return an EditPolicyIterator
	 */
	protected final EditPolicyIterator getEditPolicyIterator() {
		return new EditPolicyIterator(policies);
	}