protected Set<String> getPrevouslyDefined(Map<String,Object> defined, String prefix)
	{
		final Set<String> prevSet=new HashSet<String>();
		for(final String key : defined.keySet())
		{
			if(key.toUpperCase().startsWith(prefix.toUpperCase()))
				prevSet.add(key.toUpperCase());
		}
		return prevSet;
	}