*/
    protected void addNextTrailer(PTrailer nextTrailer) {
        nextTrailer.getPrimaryCrossReference().addToEndOfChainOfPreviousXRefs(getPrimaryCrossReference());

        // Later key,value pairs take precedence over previous entries
        Hashtable nextDictionary = nextTrailer.getDictionary();
        Hashtable currDictionary = getDictionary();
        Enumeration currKeys = currDictionary.keys();
        while (currKeys.hasMoreElements()) {
            Object currKey = currKeys.nextElement();
            if (!nextDictionary.containsKey(currKey)) {
                Object currValue = currDictionary.get(currKey);
                nextDictionary.put(currKey, currValue);
            }
        }
    }