Spatiotemporal = Spatial X Temporal.

There has been a constant debate about how to integrate spatial and temporal representation together. Three-dimensionalists believe that objects only have spatial dimensions; thus, they take space and time as two separate domains, so-called ”three-plus-one” dimensional approach. Controversially, four-dimensionalists argue that objects extend on time just as they extend on space, in which space and time is one primitive domain. In this research, we attempt to harmonize both of these views and interlink the two;meanwhile we justify our choices through a set of motivating scenarios. We also present our axiomatization of spatiotemporal regions and their mereotopology using the product order of spatial and temporal mereotopologies.