rule method

Returns the rule at a specified location in the grid. Rules are addressed using cell coordinates (with (1,1) being the upper left cell). For cell (m,n), (m,n) is actually the cell's upper left corner.

rule(startCol, startRow, endCol, endRow)
Parameters	unsigned longstartCol The starting column of the rule. unsigned longstartRow The ending column of the rule. It must be startCol (for a vertical rule) or startCol + 1 (for a horizontal rule). unsigned longendCol The starting row of the rule. unsigned longendRow The ending row of the rule. It must be startRow (for a horizontal rule) or starRow + 1 (for a vertical rule).
Returns	TableRule. The rule at the indicated location.
Throws	TableException INVALID_INDEX_ERR: Raised if the indexes given do not specify a rule in this grid.