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5.2.3 Under- and overbraces

Unfortunately there is no standard way to input an overbrace construct in MathML. In LaTeX you can say 

     $\overbrace{(x_1, x_2, \ldots, x_n)}^{\text{$n$ elements}}$

Its tbook representation is 

     <mover>
       <m>(x_1, x_2, &hellip;, x_n)</m>
       <mover>
         <mo>&OverBrace;</mo>
         <mrow>
           <mi>n</mi>
           <mtext>&nbsp;elements</mtext>
         </mrow>
       </mover>
     </mover>

The underbrace works accordingly.