indexOf Function

first argument– a list value to search

second argument– value for which to search

third argument– (optional) starting index

This function returns either the ordinal position of a list element that matches a given value or -1 (the given value is not in the list).

Example 1

The following expression returns 1.

<indexOf>
   <list>
      <s>apples</s>
      <s>oranges</s>
   </list>
   <s>oranges</s>
</indexOf>

Example 2

The following expression returns 3.

<indexOf>
   <list
      <s>apples</s>
      <s>oranges</s>
   </list>
   <s>oranges</s>
<i>2</i>
</indexOf>