[Haskell-cafe] Field names

In type section of the Gentle Introduction to Haskell http://www.cs.sfu.ca/CC/SW/Haskell/hugs/tutorial-1.4-html/moretypes.htmlther... is this example:

data Point = Pt {pointx, pointy :: Float}

abs (Pt {pointx = x, pointy = y}) = sqrt (x*x + y+y)

Why is it pointx=x and not x=pointx? -- Daryoush Weblog: http://perlustration.blogspot.com/