[inner block: Header row, column 1 (header rows optional)]	[inner block: Header 2 ]	[inner block: Header 3 ]	[inner block: Header 4 ]
body row 1, column 1	column 2	column 3	column 4
body row 2	Cells may span columns.
body row 3	[inner block: Cells may span rows. ]	[inner block: - Table cells - contain - body elements.]
body row 4