  We generalise the Clark-Ocone formula for functions to give analogous
representations for differential forms on the classical Wiener space. Such
formulae provide explicit expressions for closed and co-closed differential
forms and, as a by-product, a new proof of the triviality of the L^2 de Rham
cohomology groups on the Wiener space, alternative to Shigekawa's approach [16]
and the chaos-theoretic version [18]. This new approach has the potential of
carrying over to curved path spaces, as indicated by the vanishing result for
harmonic one-forms in [6]. For the flat path group, the generalised Clark-Ocone
formulae can be proved directly using the It\^o map.
