Help on the deformer object

[Dean Card]

I am trying to use a MESH transform from the Python Imaging Library and am 
having trouble defining my deformer object.  What I want to do is map one 
eight item tuple like
(x0, y0, x1, y1, x2, y2, x3, y3) to another set of points like
(x00, y00, x10, y10, x20, y20, x30, y30)

where (xn, yn) is a point.

>From the docs:
im.transform(size, MESH, data, filter) image => image
Similar to QUAD, but data is a list of target rectangles and corresponding 
source quadrilaterals.

What I need to know is the format that the MESH should be in... a list of 
target rectangles and corresponding source quadrilaterals???
[(x0, y0, x1, y1, x2, y2, x3, y3) , (x00, y00, x10, y10, x20, y20, x30, 
y30)] does not work.

Thanks.