<expr>

Purpose The <expr> clause is used to perform calculations as part of the <eval> statement.
Format <expr>
   {expression}
</expr>

{expression} an expression that can be calculated. It may contain mathematical operators and calculation functions.
Example #1 <eval>
   <expr>5 + 6</expr>
</eval>

yields 11

Example #2 <eval>
   <parm type="string" name="a">atom</parm>
   <expr>len(a) < 5</expr>
</eval>

yields true

Example #3 <eval>
   <parm type="string" name="a">atom</parm>
   <expr>(len(a) + 5) < 5</expr>
</eval>

yields false