class XMLResources implements Comparator<Object> {

	public synchronized long computeNextIdentifier() {
		long id = this.nextFreeId;
		while (this.resourcesFromIdentifiers.containsKey(id)) {
			++id;
		}
		this.nextFreeId = id + 1;
		return id;
	}

	public  XMLResources(PathBuilder pathBuilder);

}