  We study the automorphisms of graph products of cyclic groups, a class of
groups that includes all right-angled Coxeter and right-angled Artin groups. We
show that the group of automorphism generated by partial conjugations is itself
a graph product of cyclic groups providing its defining graph does not contain
any separating intersection of links (SIL). In the case that all the cyclic
groups are finite, this implies that the automorphism group is virtually
CAT(0); it has a finite index subgroup which acts geometrically on a
right-angled building.
