is a concatenation of the alphanumeric column name and the
index of the row.
Example: The cell in the 4th column and third row has the name "D3".
In cells that are split, the naming convention is more complex.
In this case the name is a concatenation of the former cell name
(i.e. "D3") and the number of the new column and row index inside
of the original table cell separated by dots. This is done
recursively.
Example: If the cell "D3" is horizontally split, it now contains
the cells "D3.1.1" and "D3.1.2"