  The 1994 data published by the H1 collaboration are compared with models
based on Regge phenomenology. The $x_{\PO}$ dependence of the data can be
described in a model based on the exchange of a dominant diffractive (pomeron)
trajectory with additional sub-leading reggeon contributions. The dynamics of
the Pomeron structure is studied within the framework of perturbative QCD and
new parton distributions are obtained. These parton distributions will allow a
direct test of factorisation breaking at Tevatron.
