Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.

To recap, the instance includes a row element for each row of the grid, and square elements that help to emulate rows for calculating the 3x3 squares on the grid.

Specifically, a resource child element for the XForms submission element that will allow a URI to be used for dynamically calculating the submission based on instance data.