Description
The fn:subsequence function returns a sequence of $length items of $sourceSeq , starting at the position $startingLoc . The first item in the sequence is considered to be at position 1, not 0. If no $length is passed, or if $length is greater than the number of items that can be returned, the function includes items to the end of the sequence. An alternative to calling the fn:subsequence function is using a predicate. For example, fn:subsequence($a,3,4) is equivalent to $a[position() = (3 to 7)] .
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 
$sourceSeq 
item()* 
the entire sequence 
$startingLoc 
xs:double 
the starting item position (1based) 
$length 
xs:double 
the number of items to include 
return value 
item()* 
ExamplesXPath Example  Results 

subsequence(
('a', 'b', 'c', 'd', 'e'), 3) 
('c', 'd', 'e') 
subsequence(
('a', 'b', 'c', 'd', 'e'), 3, 2) 
('c', 'd') 
subsequence(
('a', 'b', 'c', 'd', 'e'), 3, 10) 
('c', 'd', 'e') 
subsequence(
('a', 'b', 'c', 'd', 'e'), 10) 
() 
subsequence(
('a', 'b', 'c', 'd', 'e'), 2, 5) 
('a', 'b') 
subsequence( (), 3) 
() 
History 
Recommended Reading:
