- XQuery Tutorial
- XQuery - Home
- XQuery - Overview
- XQuery - Environment Setup
- XQuery - First Application
- XQuery - FLWOR
- XQuery - HTML Format
- XQuery - XPath
- XQuery - Sequences
- XQuery - Sequence Functions
- XQuery - String functions
- XQuery - Date Functions
- XQuery - Regular Expressions
- XQuery - If Then Else
- XQuery - Custom Functions
- XQuery Useful Resources
- XQuery - Quick Guide
- XQuery - Useful Resources
- XQuery - Discussion
XQuery - subsequence Function
The subsequence function is used to get the sequence containing requested items present in a given sequence.
Syntax
subsequence($seq as item()*, $startingLoc as xs:double, $length as xs:double)
Input Parameters
$seq − provided sequence. Sequence can contain 0 or more items.
$startingLoc − index of items from which sub-sequence is to be created. Index starts from 1.
$length − length of subsequence.
Example
XQuery Expression
let $items := (1,2,3,4,5,6) let $sub-items := subsequence($items,2,4) return <result> <items> { for $item in $sub-items return <item>{$item}</item> } </items> </result>
Output
<result> <items> <item>2</item> <item>3</item> <item>4</item> <item>5</item> </items> </result>
Verify the Result
In order to test the above-mentioned functionality, replace the contents of books.xqy (mentioned in Environment Setup chapter) with the above XQuery expression and execute the XQueryTester java program to verify the result.
xquery_sequence_functions.htm
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