  Extending the concept of parton densities onto nonforward matrix elements
<p'|O(0,z)|p> of quark and gluon light-cone operators, one can use two types of
nonperturbative functions: double distributions (DDs) f(x,\alpha;t), F(x,y;t)
and skewed (off&nonforward) parton distributions (SPDs) H(x,\xi;t),
F_\zeta(X,t). We treat DDs as primary objects producing SPDs after integration.
We emphasize the role of DDs in understanding interplay between X (x) and \zeta
(\xi) dependences of SPDs.In particular, the use of DDs is crucial to secure
the polynomiality condition: Nth moments of SPDs are Nth degree polynomials in
the relevant skewedness parameter \zeta or \xi. We propose simple ansaetze for
DDs having correct spectral and symmetry properties and derive model
expressions for SPDs satisfying all known constraints. Finally, we argue that
for small skewedness, one can obtain SPDs from the usual parton densities by
averaging the latter with an appropriate weight over the region [X-\zeta,X] (or
[x - \xi, x + \xi]).
