  We point out that the dynamical fermion mass generation in the 3D compact
U(1) lattice gauge theory with charged fermion and scalar fields (chi-U-phi_3
model) may be of relevance for the spinon-holon theory with local gauge
symmetry in the condensed matter physics. However, many properties of the model
are uncertain, so we make some conjectures to motivate their future
investigation. Most probably, for strong gauge coupling the model is by
universality equivalent to the familiar 3D four-fermion coupling models with
N_f=2. Available numerical results indicate that at the intermediate and weak
gauge coupling two universality classes with new interesting physics may arise.
One of them is associated with a tricritical point which probably exists in the
phase diagram of the model. The other one is determined by the dynamical
fermion mass generation in the compact QED_3, which is insufficiently
understood but of much interest by itself.
