docs: def node_mustInclude(self, al_mustInclude, ab_reset=False):
              """
              Either appends or resets the <mustInclude> list of snode_current
              depending on <ab_reset>.
              """
              if ab_reset:
                  self.snode_current.l_mustInclude = al_mustInclude[:]
              else:
                  l_current   = self.snode_current.l_mustInclude[:]
                  l_total     = l_current + al_mustInclude
                  self.snode_current.l_mustInclude = l_total[:]