Description
The fn:indexof function returns the position(s) of an atomic value within a sequence. The $seqParam argument is the sequence to be searched, while $srchParam is the value to search for. This function returns a sequence of integers representing the position(s) of the value within the sequence, in order, starting with 1 (not 0).
The $seqParam sequence must contain all atomic values, or nodes that have atomic typed values. The items in the sequence are compared to the search value by their typed value, not node identity. Untyped values are treated like strings.
This description is © Copyright 2007, Priscilla Walmsley. It is excerpted from the book XQuery by Priscilla Walmsley, O'Reilly, 2007. For a complete explanation of this function, please refer to Appendix A of the book. Arguments and Return TypeName  Type  Description 
$seqParam 
xs:anyAtomicType* 
the sequence of values 
$srchParam 
xs:anyAtomicType 
the value to find the index of 
$collation 
xs:string 
the collation to use for comparing strings 
return value 
xs:integer* 
ExamplesXPath Example  Results 

indexof( ('a', 'b', 'c'), 'a') 
1 
indexof( ('a', 'b', 'c'), 'd') 
() 
indexof( (4, 5, 6, 4), 4) 
(1, 4) 
indexof( (4, 5, 6, 4), 04.0) 
(1, 4) 
indexof( ('a', 5, 6), 'a') 
1 
indexof( (), 'a') 
() 
indexof( (<a>1</a>, <b>1</b>), <c>1</c> ) 
(1, 2) 
See AlsoHistory 
Recommended Reading:
