In this particular case, yes.  But what if the following (I didn't
check if the OP made clear this could happen or not)?

   <base>
     <foo>
       <bar1>123</bar1>
     </foo>
     <bar>
       <foo1>xyz</foo1>
     </bar>
   </base>

my logic will not work in this case. I can attempt to solve this case
as well, if OP requires it.

The OP now has a different requirement. I don't have a solution to
that just now.

Regards,
Mukul