This is a feature which is just listed here without examples. It allows to insert a expand a substring based on the derivation of a condition.
{IFTHENELSE(predicate,thenstring,elsestring}
The `predicate' is either {GREATER(expr1,expr2)} or {EQUAL,expr1,expr2}. For example: {GREATER({this.salary},10000)}.
Note that the arguments may also contain expressions.