HARD AND SOFT COLOUR SINGLET EXCHANGE IN THE SEMICLASSICAL APPROACH

In the present talk diffraction in deep inelastic scattering is discussed in the framework of the semiclassical approach. The main emphasis is on the possibility of a consistent semiclassical description of both hard and soft colour singlet exchange processes. This approach allows the comparison of hard and soft colour neutralization in diffractive electroproduction of high-p_⊥ jets or heavy quarks.