if (!subcollections.containsKey(childName)) subcollections.put(childName, child.address);
if (!subcollections.contains(childName)) subcollections.add(childName);
	public void addCollection(Collection child) {		final int p = child.name.lastIndexOf('/') + 1;		final String childName = child.name.substring(p);		if (!subcollections.containsKey(childName))			subcollections.put(childName, child.address);	}