code: public Transliterator get(String ID,
                                StringBuffer aliasReturn) {
          Object[] entry = find(ID);
          return (entry == null) ? null
              : instantiateEntry(ID, entry, aliasReturn);
      }
docs: Given a simple ID (forward direction, no inline filter, not
  compound) attempt to instantiate it from the registry.  Return
  0 on failure.
  
  Return a non-empty aliasReturn value if the ID points to an alias.
  We cannot instantiate it ourselves because the alias may contain
  filters or compounds, which we do not understand.  Caller should
  make aliasReturn empty before calling.