# File lib/ruote/exp/fe_inc.rb, line 162
    def reply_to_parent(workitem)

      h.applied_workitem['fields'] = workitem['fields']

      key, value = if var_key = has_attribute(:v, :var, :variable)

        var = attribute(var_key)

        [ "v:#{var}", new_value(:var, var, nil) ]

      elsif field_key = has_attribute(:f, :fld, :field)

        field = attribute(field_key)

        [ field, new_value(:field, field, nil) ]

      elsif k = att_text

        [ k, new_value(nil, k, nil) ]

      elsif kv = find_kv

        k, v = kv

        [ k, new_value(nil, k, v) ]

      else

        raise(ArgumentError.new('no variable or field to increment/decrement'))
      end

      h.variables = nil
        # the local scope is over,
        # variables set here will be set in the parent scope

      if dec? && value.is_a?(Array)
        k, car, value = value
        set_vf(k || '__result__', car)
      end

      set_vf(key, value)

      super(h.applied_workitem)
    end