code: public CompoundName getFirstInChain()
    {
      if (tc.isEntryEnabled())
        SibTr.entry(tc, "getFirstInChain");
        
      CompoundName firstInChain = collector.getFirst();
      
      if (tc.isEntryEnabled())
        SibTr.exit(tc, "getFirstInChain", firstInChain);
        
      return firstInChain;
    }
docs: Get the first compound name in any alias chain we're validating.
  
  @return  Will return null if no chain has yet been built up.