composite types

heres one way this could work at just the mapper level:

   class Point(object):
       def __init__(self, x, y):
           self.x = x
           self.y = y
       def __colset__(self):
           return [self.y](self.x,)

   mapper(class, table, properties={
         'vertex':composite(table.c.xpos, table.c.ypos, Point)
    }
   )

the composite function would resolve to CompositeProperty. the columns in the row would translate to Point(col1, col2) and instances of the Point class would be translated back via __colset__ (or something like that).

should composite types be available at the table level ? probably not since Tables are supposed to act like database tables.

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