In Mapfish Print Modules YAML, how do I break a string over multiple lines?

Question

In MapFish Printing Module YAML, I have a string that's very long. so I'd like to break the string . What's the syntax for this?

In other words, I have this:

• !columns config: width: 5 # borderWidth: 1 # borderColor: black cells: - padding: 10 paddingBottom: 10 vertAlign: middle width: 5 maxSize: 100 absoluteX: 35 absoluteY: 111 width: 5 height:350 items: - !text font: Kalpurush fontEncoding: Identity-H
  fontSize: 12 #align: center text: '${onm} ${fnm}'
  textMaxWidth: 8
  maxWidth: 5 maxHeight: 15

I have parameter as '${Name} ${FatherName}' , I need to put break or newline in String for this parameter.