Which microflow expression indicates that a Course has been selected in an exclusive split?

The expression indicating that a Course has been selected in an exclusive split is based on checking whether the relevant attribute has a valid value. In this case, the correct answer relies on comparing the attribute associated with the TrainingEvent object to ensure it is not empty.

The expression stating that $TrainingEvent/TrainingEvent_Course != empty is correct because it explicitly checks if the TrainingEvent_Course attribute contains any data. In Mendix, when using this kind of comparison, it is meaningful to confirm that the data structure of an object includes a selected value, which is represented as non-empty. This is particularly relevant in scenarios where choices are being made and only a valid selection is acceptable for the process to continue.

Using 'empty' is appropriate when dealing with string or list attributes in Mendix, as it signifies that no item has been selected or assigned. If this condition is met, it means that a Course has indeed been selected, allowing the flow of the microflow to proceed to the next step.

Other options may refer to different forms of checking for existence or conditions on the objects, but they do not correctly capture the intent of checking for an actual selection in the context provided. These various checks may include null checks or comparisons with bo