code: public void append(String firstVal, String... otherVals) throws IOException {
  		output.append(firstVal);
  		for (String v : otherVals)
  			output.append(valSep).append(v);
  		output.append(lineSep);
  	}
docs: Appends a line to the writer. The values are separated using the current
  separator, an line separator is appended at the end.
  
  @param firstVal
  The first value of the line
  @param otherVals
  The remaining values
  @throws IOException