Format options:

       /DESCENDANTS
       /NODESCENDANTS (default)

    Specifies whether CDO deletes children. When you specify the
    /DESCENDANTS qualifier, and your generic element is controlled,
    CDO deletes all children that are not also children of additional
    elements outside the area defined by your top collection. If the
    generic element is uncontrolled, CDO deletes all children that
    are not also children of other elements.