  Recent results by the authors on proton diffractive dissociation (single,
double and central) in the low-mass resonance region with emphasis on the LHC
kinematics are reviewed and updated. Based on the previous ideas that the
contribution of the inelastic proton-Pomeron vertex can be described by the
proton structure function, the contribution of the inelastic Pomeron-Pomeron
vertex appearing in central diffraction is now described by a Pomeron structure
function.
