Calendar Heatmap lists two Position top ports when only one is needed
Q-36 Calendar Heatmap
Issue. The printed card shows two Position top ports. This would need two different attributes mapped to position. However, the most common use case for a calendar heatmap is to show a single categorical variable across time, so only one Position port is needed, corresponding to the temporal attribute. The fact that the heatmap may have a height and and width is an artifact of the layout that will try to match weeks, months, etc. in a calendar shape, but ultimately the position of each cell is determined by its temporal value only.
Ruling. Treat Q-36 as having a single Position top port.
