<addition xttl="add-tex.xttl"     \mathexr[op="addition"  
          carry="yes"                      xttl="add-tex.xttl"  
          steps="yes"                      carry="yes"  
          result="yes"                     steps="yes"  
          currency="alone">                result="yes"  
  <operands>                               currency="alone"]{ 1, 23}  
    <operand>1</operand>  
    <operand>23</operand>  
  </operands>  
</addition>