This can be used to create an automatic numbering system for your content.
(prop("Parent")
? prop("Parent").at(0).prop("Outline")
+ "." + prop("Order")
: prop("Order"))
.upper()/* Check if 'Parent' has a value */
(prop("Parent")
/* If it does, display the parent's 'Outline' value */
? prop("Parent").at(0).prop("Outline")
/* ... then output a period followed by the value of 'Order' */
+ "." + prop("Order")
/* Otherwise, simply display the value of 'Order' */
: prop("Order"))
/* Convert the result to uppercase */
.upper()