  In this paper we develop a representation formula of Clark-Ocone type for any
integrable Poisson functionals, which extends the Poisson imbedding for point
processes. This representation formula differs from the classical Clark-Ocone
formula on three accounts. First the representation holds with respect to the
Poisson measure instead of the compensated one; second the representation holds
true in L1 and not in L2; and finally contrary to the classical Clark-Ocone
formula the integrand is defined as a pathwise operator and not as a
L2-limiting object. We make use of Malliavin's calculus and of the
pseudo-chaotic decomposition with uncompensated iteraded integrals to establish
this Pseudo-Clark-Ocone representation formula and to characterize the
integrand, which turns out to be a predictable integrable process.
