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   $aXML =~ s@&lab;@\<@gs;
   $aXML =~ s@&rab;@\>@gs;
...
   $aXML =~ s@&rcb;@\)@gs;
   $aXML =~ s@&lsb;@\[@gs;
   $aXML =~ s@&rsb;@\]@gs;

pseudocode
...
      }
   }

  <baz><qd>foo</qd></baz>

  <baz>bar</baz>