v		input view
w		argument view

Product returns a view which is the cartesian product of v and w.

set v [view {A B} def {a b aa bb}]
set w [view {C D} def {c d cc dd}]

view $v product $w

	A	B	C	D
0	a	b	c	d
1	a	b	cc	dd
2	aa	bb	c	d
3	aa	bb	cc	dd