code: public SequenceLabel getNextToken() {
      if (this.nextToken == null) {
        try {
          this.nextToken = this.jlexer.yylex();
        } catch (final IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
      final SequenceLabel result = this.nextToken;
      this.nextToken = null;
      if (result == null) {
        throw new NoSuchElementException();
      }
      return result;
    }
docs: Get the next token provided by yylex().
  
  @return the next name