code: @SuppressWarnings({ "rawtypes", "unchecked" })
  	@Override
  	public PrefixedPropertiesEnumeration<Object> elements() {
  		lock.readLock().lock();
  		try {
  			final Collection values = values();
  			final Iterator it = values.iterator();
  			return new PrefixedPropertiesEnumerationImpl(it);
  		} finally {
  			lock.readLock().unlock();
  		}
  	}
docs: /*
  (non-Javadoc)
  
  @see java.util.Hashtable#elements()