code: protected void encode1stLevelEventCode(int pos) throws IOException {
  		int codeLength = fidelityOptions
  				.get1stLevelEventCodeLength(getCurrentGrammar());
  		if (codeLength > 0) {
  			channel.encodeNBitUnsignedInteger(pos, codeLength);
  		}
  	}
docs: /*
  Event-Codes