Display:

$\{x\colon (x< 5)\land x\in \mathbb{N}\}$

Source:

<set>
     <bvar>
          <ci> x </ci>
     </bvar>
     <condition>
          <apply>
               <and/>
               <apply>
                    <lt/>
                    <ci> x </ci>
                    <cn> 5 </cn>
               </apply>
               <apply>
                    <in/>
                    <ci> x </ci>
                    <naturalnumbers/>
               </apply>
          </apply>
     </condition>
     <ci> x </ci>
</set>