Dear Arcelli & Libor, a partial response below is limited to our experience w/in the North American market:

The term "vegan" when used to create & market retail food products; whether bakery or other RTE/convenience items,  excludes the use of any & all ingredients derived from animal sources and specifically including dairy.  Further, the use of "pantry-friendly" (aka clean labels) ingredients will go hand-in-hand w/in this product-space....... of "natural" or minimally refined foods.  In consequence, the use of polyols or refined and/or synthetically-derived fibers are incompatible w/in these sectors......regards....Roberto