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[Martin Sandve Alnæs <martinal@xxxxxxxxx>]

In r946 Zero was exposed to the ufl namespace. What is that used for?

from ufl.constantvalue import PermutationSymbol, Identity, Zero, as_ufl

If it's for internal ffc usage, it can be retrieved as from ufl.classes
import Zero.
If it's needed for users, I would rather add something like:

def zero(*shape):
    return Zero(shape)

Usage:
d = cell.d
v = zero(d)
M = zero(d, d)

For consistency and to hide the index dimensions details from the user.

Martin