The <<or...>> function performs the logical disjunction of two or more Boolean values. Each argument is compared in the order listed until a true value is found, at which point the function returns true. If all arguments contain a false value, then the function will return false.
This function is almost always used as an argument to another function, normally the <<if...>> function. The reason for this is that the value returned is a Boolean value within the SDML and will simply return the text value of either “true” or “false” if not passed as an argument to a function.