code: @Override
  	public void addHeadLine(final String type, final String aLine) {
  		ArrayList<String> lines = headers.get(type);
  
  		if (lines == null) {
  			lines = new ArrayList<>();
  			headers.put(type, lines);
  		}
  
  		lines.add(aLine);
  	}
docs: Records a "shared" line (of a specified type) for inclusion in the output.
  
  @param type the type of line.
  @param aLine the line to include.