  We argue that diffractive DIS, dominated by soft interactions, is probably
the unique process which allows us to observe unitarity effects in DIS. Guided
by a close analogy between the diffractive dissociation of a highly virtual
photon and the elastic scattering of hadrons we propose a specific procedure to
analyse the data in order to detect the onset of the unitarity limit. Lacking
appropriate data, we use the predictions of a realistic model as an input for
our analysis, to demonstrate that the output unitarity signal is sufficiently
large to be detectable.
