Example 2

The following expression returns -16. This expression returns a number that indicates the difference between the letters r and b when presented in alphabetical order. Since there are 16 letters between the letters b and r, when bob is compared to ray, the value is -16. Alternatively, if r were compared to b, the value returned would be 16.

<cmp>
    <s>bob</s>
    <s>ray</s>
</cmp>