if (null != persistedSource) retval = (SignetSubject)persistedSource.getSubjectByIdentifier(identifier);
	public SignetSubject getSubjectByIdentifier(String identifier)	{		if ((null == identifier) || (0 >= identifier.length()))			return (null);		SignetSubject retval = null;		for (Iterator srcs = signetSources.iterator();				srcs.hasNext() && (null == retval);)		{			SignetSource src = (SignetSource)srcs.next();			retval = (SignetSubject)src.getSubjectByIdentifier(identifier);		}		return (retval);	}