w3schools    w3Schools
Search W3Schools :
   
HOME HTML CSS XML JAVASCRIPT ASP PHP SQL MORE...   References Examples Forum About
ADVERTISEMENTS

XML Certification
Download XML editor
Custom Programming
 
Table of contents
XPath Tutorial
XPath HOME
XPath Intro
XPath Nodes
XPath Syntax
XPath Axes
XPath Operators
XPath Examples
XPath Summary

References
XPath Functions

Selected Reading
Web Statistics
Web Glossary
Web Hosting
Web Quality

W3Schools Tutorials
W3Schools Forum

Helping W3Schools

 

XPath, XQuery, and XSLT Functions

Previous Next

The following reference library defines the functions required for XPath 2.0, XQuery 1.0 and XSLT 2.0.


Functions Reference

The default prefix for the function namespace is fn:, and the URI is:
http://www.w3.org/2005/02/xpath-functions.

Accessor Functions

Name Description
fn:node-name(node) Returns the node-name of the argument node
fn:nilled(node) Returns a Boolean value indicating whether the argument node is nilled
fn:data(item.item,...) Takes a sequence of items and returns a sequence of atomic values
fn:base-uri()
fn:base-uri(node)
Returns the value of the base-uri property of the current or specified node
fn:document-uri(node) Returns the value of the document-uri property for the specified node

Error and Trace Functions

Name Description
fn:error()
fn:error(error)
fn:error(error,description)
fn:error(error,description,error-object)
Example: error(fn:QName('http://example.com/test', 'err:toohigh'), 'Error: Price is too high')

Result: Returns http://example.com/test#toohigh and the string "Error: Price is too high" to the external processing environment

fn:trace(value,label) Used to debug queries

Functions on Numeric Values

Name Description
fn:number(arg) Returns the numeric value of the argument. The argument could be a boolean, string, or node-set

Example: number('100')
Result: 100

fn:abs(num) Returns the absolute value of the argument

Example: abs(3.14)
Result: 3.14

Example: abs(-3.14)
Result: 3.14

fn:ceiling(num) Returns the smallest integer that is greater than the number argument

Example: ceiling(3.14)
Result: 4

fn:floor(num) Returns the largest integer that is not greater than the number argument

Example: floor(3.14)
Result: 3

fn:round(num) Rounds the number argument to the nearest integer

Example: round(3.14)
Result: 3

fn:round-half-to-even() Example: round-half-to-even(0.5)
Result: 0

Example: round-half-to-even(1.5)
Result: 2

Example: round-half-to-even(2.5)
Result: 2

Functions on Strings

Name Description
fn:string(arg) Returns the string value of the argument. The argument could be a number, boolean, or node-set

Example: string(314)
Result: "314"

fn:codepoints-to-string(int,int,...) Returns a string from a sequence of code points

Example: codepoints-to-string(84, 104, 233, 114, 232, 115, 101)
Result: 'Thérèse'

fn:string-to-codepoints(string) Returns a sequence of code points from a string

Example: string-to-codepoints("Thérèse")
Result: 84, 104, 233, 114, 232, 115, 101

fn:codepoint-equal(comp1,comp2) Returns true if the value of comp1 is equal to the value of comp2, according to the Unicode code point collation (http://www.w3.org/2005/02/xpath-functions/collation/codepoint), otherwise it returns false
fn:compare(comp1,comp2)
fn:compare(comp1,comp2,collation)
Returns -1 if comp1 is less than comp2, 0 if comp1 is equal to comp2, or 1 if comp1 is greater than comp2 (according to the rules of the collation that is used)

Example: compare('ghi', 'ghi')
Result: 0

fn:concat(string,string,...) Returns the concatenation of the strings

Example: concat('XPath ','is ','FUN!')
Result: 'XPath is FUN!'

fn:string-join((string,string,...),sep) Returns a string created by concatenating the string arguments and using the sep argument as the separator

Example: string-join(('We', 'are', 'having', 'fun!'), ' ')
Result: ' We are having fun! '

Example: string-join(('We', 'are', 'having', 'fun!'))
Result: 'Wearehavingfun!'

Example:string-join((), 'sep')
Result: ''

fn:substring(string,start,len)
fn:substring(string,start)
Returns the substring from the start position to the specified length. Index of the first character is 1. If length is omitted it returns the substring from the start position to the end

Example: substring('Beatles',1,4)
Result: 'Beat'

Example: substring('Beatles',2)
Result: 'eatles'

fn:string-length(string)
fn:string-length()
Returns the length of the specified string. If there is no string argument it returns the length of the string value of the current node

Example: string-length('Beatles')
Result: 7

fn:normalize-space(string)
fn:normalize-space()
Removes leading and trailing spaces from the specified string, and replaces all internal sequences of white space with one and returns the result. If there is no string argument it does the same on the current node

Example: normalize-space(' The   XML ')
Result: 'The XML'

fn:normalize-unicode()  
fn:upper-case(string) Converts the string argument to upper-case

Example: upper-case('The XML')
Result: 'THE XML'

fn:lower-case(string) Converts the string argument to lower-case

Example: lower-case('The XML')
Result: 'the xml'

fn:translate(string1,string2,string3) Converts string1 by replacing the characters in string2 with the characters in string3

Example: translate('12:30','30','45')
Result: '12:45'

Example: translate('12:30','03','54')
Result: '12:45'

Example: translate('12:30','0123','abcd')
Result: 'bc:da'

fn:escape-uri(stringURI,esc-res) Example: escape-uri("http://example.com/test#car", true())
Result: "http%3A%2F%2Fexample.com%2Ftest#car"

Example: escape-uri("http://example.com/test#car", false())
Result: "http://example.com/test#car"

Example: escape-uri ("http://example.com/~bébé", false())
Result: "http://example.com/~b%C3%A9b%C3%A9"

fn:contains(string1,string2) Returns true if string1 contains string2, otherwise it returns false

Example: contains('XML','XM')
Result: true

fn:starts-with(string1,string2) Returns true if string1 starts with string2, otherwise it returns false

Example: starts-with('XML','X')
Result: true

fn:ends-with(string1,string2) Returns true if string1 ends with string2, otherwise it returns false

Example: ends-with('XML','X')
Result: false

fn:substring-before(string1,string2) Returns the start of string1 before string2 occurs in it

Example: substring-before('12/10','/')
Result: '12'

fn:substring-after(string1,string2) Returns the remainder of string1 after string2 occurs in it

Example: substring-after('12/10','/')
Result: '10'

fn:matches(string,pattern) Returns true if the string argument matches the pattern, otherwise, it returns false

Example: matches("Merano", "ran")
Result: true

fn:replace(string,pattern,replace) Returns a string that is created by replacing the given pattern with the replace argument

Example: replace("Bella Italia", "l", "*")
Result: 'Be**a Ita*ia'

Example: replace("Bella Italia", "l", "")
Result: 'Bea Itaia'
fn:tokenize(string,pattern) Example: tokenize("XPath is fun", "\s+")
Result: ("XPath", "is", "fun")

Functions for anyURI

Name Description
fn:resolve-uri(relative,base)  

Functions on Boolean Values

Name Description
fn:boolean(arg) Returns a boolean value for a number, string, or node-set
fn:not(arg) The argument is first reduced to a boolean value by applying the boolean() function. Returns true if the boolean value is false, and false if the boolean value is true

Example: not(true())
Result: false

fn:true() Returns the boolean value true

Example: true()
Result: true

fn:false() Returns the boolean value false

Example: false()
Result: false

Functions on Durations, Dates and Times

Component Extraction Functions on Durations, Dates and Times

Name Description
fn:dateTime(date,time) Converts the arguments to a date and a time
fn:years-from-duration(datetimedur) Returns an integer that represents the years component in the canonical lexical representation of the value of the argument
fn:months-from-duration(datetimedur) Returns an integer that represents the months component in the canonical lexical representation of the value of the argument
fn:days-from-duration(datetimedur) Returns an integer that represents the days component in the canonical lexical representation of the value of the argument
fn:hours-from-duration(datetimedur) Returns an integer that represents the hours component in the canonical lexical representation of the value of the argument
fn:minutes-from-duration(datetimedur) Returns an integer that represents the minutes component in the canonical lexical representation of the value of the argument
fn:seconds-from-duration(datetimedur) Returns a decimal that represents the seconds component in the canonical lexical representation of the value of the argument
fn:year-from-dateTime(datetime) Returns an integer that represents the year component in the localized value of the argument

Example: year-from-dateTime(xs:dateTime("2005-01-10T12:30-04:10"))
Result: 2005

fn:month-from-dateTime(datetime) Returns an integer that represents the month component in the localized value of the argument

Example: month-from-dateTime(xs:dateTime("2005-01-10T12:30-04:10"))
Result: 01

fn:day-from-dateTime(datetime) Returns an integer that represents the day component in the localized value of the argument

Example: day-from-dateTime(xs:dateTime("2005-01-10T12:30-04:10"))
Result: 10

fn:hours-from-dateTime(datetime) Returns an integer that represents the hours component in the localized value of the argument

Example: hours-from-dateTime(xs:dateTime("2005-01-10T12:30-04:10"))
Result: 12

fn:minutes-from-dateTime(datetime) Returns an integer that represents the minutes component in the localized value of the argument

Example: minutes-from-dateTime(xs:dateTime("2005-01-10T12:30-04:10"))
Result: 30

fn:seconds-from-dateTime(datetime) Returns a decimal that represents the seconds component in the localized value of the argument

Example: seconds-from-dateTime(xs:dateTime("2005-01-10T12:30:00-04:10"))
Result: 0

fn:timezone-from-dateTime(datetime) Returns the time zone component of the argument if any
fn:year-from-date(date) Returns an integer that represents the year in the localized value of the argument

Example: year-from-date(xs:date("2005-04-23"))
Result: 2005

fn:month-from-date(date) Returns an integer that represents the month in the localized value of the argument

Example: month-from-date(xs:date("2005-04-23"))
Result: 4

fn:day-from-date(date) Returns an integer that represents the day in the localized value of the argument

Example: day-from-date(xs:date("2005-04-23"))
Result: 23

fn:timezone-from-date(date) Returns the time zone component of the argument if any
fn:hours-from-time(time) Returns an integer that represents the hours component in the localized value of the argument

Example: hours-from-time(xs:time("10:22:00"))
Result: 10

fn:minutes-from-time(time) Returns an integer that represents the minutes component in the localized value of the argument

Example: minutes-from-time(xs:time("10:22:00"))
Result: 22

fn:seconds-from-time(time) Returns an integer that represents the seconds component in the localized value of the argument

Example: seconds-from-time(xs:time("10:22:00"))
Result: 0

fn:timezone-from-time(time) Returns the time zone component of the argument if any
fn:adjust-dateTime-to-timezone(datetime,timezone) If the timezone argument is empty, it returns a dateTime without a timezone. Otherwise, it returns a dateTime with a timezone
fn:adjust-date-to-timezone(date,timezone) If the timezone argument is empty, it returns a date without a timezone. Otherwise, it returns a date with a timezone
fn:adjust-time-to-timezone(time,timezone) If the timezone argument is empty, it returns a time without a timezone. Otherwise, it returns a time with a timezone

Functions Related to QNames

Name Description
fn:QName()  
fn:local-name-from-QName()  
fn:namespace-uri-from-QName()  
fn:namespace-uri-for-prefix()  
fn:in-scope-prefixes()  
fn:resolve-QName()  

Functions on Nodes

Name Description
fn:name()
fn:name(nodeset)
Returns the name of the current node or the first node in the specified node set
fn:local-name()
fn:local-name(nodeset)
Returns the name of the current node or the first node in the specified node set - without the namespace prefix
fn:namespace-uri()
fn:namespace-uri(nodeset)
Returns the namespace URI of the current node or the first node in the specified node set
fn:lang(lang) Returns true if the language of the current node matches the language of the specified language

Example: Lang("en") is true for
<p xml:lang="en">...</p>

Example: Lang("de") is false for
<p xml:lang="en">...</p>

fn:root()
fn:root(node)
Returns the root of the tree to which the current node or the specified belongs. This will usually be a document node

Functions on Sequences

General Functions on Sequences

Name Description
fn:index-of((item,item,...),searchitem) Returns the positions within the sequence of items that are equal to the searchitem argument

Example: index-of ((15, 40, 25, 40, 10), 40)
Result: (2, 4)

Example: index-of (("a", "dog", "and", "a", "duck"), "a")
Result (1, 4)

Example: index-of ((15, 40, 25, 40, 10), 18)
Result: ()

fn:remove((item,item,...),position) Returns a new sequence constructed from the value of the item arguments - with the item specified by the position argument removed

Example: remove(("ab", "cd", "ef"), 0)
Result: ("ab", "cd", "ef")

Example: remove(("ab", "cd", "ef"), 1)
Result: ("cd", "ef")

Example: remove(("ab", "cd", "ef"), 4)
Result: ("ab", "cd", "ef")

fn:empty(item,item,...) Returns true if the value of the arguments IS an empty sequence, otherwise it returns false

Example: empty(remove(("ab", "cd"), 1))
Result: false

fn:exists(item,item,...) Returns true if the value of the arguments IS NOT an empty sequence, otherwise it returns false

Example: exists(remove(("ab"), 1))
Result: false

fn:distinct-values((item,item,...),collation) Returns only distinct (different) values

Example: distinct-values((1, 2, 3, 1, 2))
Result: (1, 2, 3)

fn:insert-before((item,item,...),pos,inserts) Returns a new sequence constructed from the value of the item arguments - with the value of the inserts argument inserted in the position specified by the pos argument

Example: insert-before(("ab", "cd"), 0, "gh")
Result: ("gh", "ab", "cd")

Example: insert-before(("ab", "cd"), 1, "gh")
Result: ("gh", "ab", "cd")

Example: insert-before(("ab", "cd"), 2, "gh")
Result: ("ab", "gh", "cd")

Example: insert-before(("ab", "cd"), 5, "gh")
Result: ("ab", "cd", "gh")

fn:reverse((item,item,...)) Returns the reversed order of the items specified

Example: reverse(("ab", "cd", "ef"))
Result: ("ef", "cd", "ab")

Example: reverse(("ab"))
Result: ("ab")

fn:subsequence((item,item,...),start,len) Returns a sequence of items from the position specified by the start argument and continuing for the number of items specified by the len argument. The first item is located at position 1

Example: subsequence(($item1, $item2, $item3,...), 3)
Result: ($item3, ...)

Example: subsequence(($item1, $item2, $item3, ...), 2, 2)
Result: ($item2, $item3)

fn:unordered((item,item,...)) Returns the items in an implementation dependent order

Functions That Test the Cardinality of Sequences

Name Description
fn:zero-or-one(item,item,...) Returns the argument if it contains zero or one items, otherwise it raises an error
fn:one-or-more(item,item,...) Returns the argument if it contains one or more items, otherwise it raises an error
fn:exactly-one(item,item,...) Returns the argument if it contains exactly one item, otherwise it raises an error

Equals, Union, Intersection and Except

Name Description
fn:deep-equal(param1,param2,collation) Returns true if param1 and param2 are deep-equal to each other, otherwise it returns false

Aggregate Functions

Name Description
fn:count((item,item,...)) Returns the count of nodes
fn:avg((arg,arg,...)) Returns the average of the argument values

Example: avg((1,2,3))
Result: 2

fn:max((arg,arg,...)) Returns the argument that is greater than the others

Example: max((1,2,3))
Result: 3

Example: max(('a', 'k'))
Result: 'k'

fn:min((arg,arg,...)) Returns the argument that is less than the others

Example: min((1,2,3))
Result: 1

Example: min(('a', 'k'))
Result: 'a'

fn:sum(arg,arg,...) Returns the sum of the numeric value of each node in the specified node-set

Functions that Generate Sequences

Name Description
fn:id((string,string,...),node) Returns a sequence of element nodes that have an ID value equal to the value of one or more of the values specified in the string argument
fn:idref((string,string,...),node) Returns a sequence of element or attribute nodes that have an IDREF value equal to the value of one or more of the values specified in the string argument
fn:doc(URI)  
fn:doc-available(URI) Returns true if the doc() function returns a document node, otherwise it returns false
fn:collection()
fn:collection(string)
 

Context Functions

Name Description
fn:position() Returns the index position of the node that is currently being processed

Example: //book[position()<=3]
Result: Selects the first three book elements

fn:last() Returns the number of items in the processed node list

Example: //book[last()]
Result: Selects the last book element

fn:current-dateTime() Returns the current dateTime (with timezone)
fn:current-date() Returns the current date (with timezone)
fn:current-time() Returns the current time (with timezone)
fn:implicit-timezone() Returns the value of the implicit timezone
fn:default-collation() Returns the value of the default collation
fn:static-base-uri() Returns the value of the base-uri


Previous Next


Learn how your website performs under various load conditions

Web Load and Performance Testing   

WAPT is a load, stress and performance testing tool for websites and web-based applications. In contrast to "800-pound gorilla" load testing tools, it is designed to minimize the learning curve and give you an ability to create a heavy load from a regular workstation. WAPT is able to generate up to 3000 simultaneously acting virtual users using standard hardware configuration. Virtual users in each profile are fully customizable. Basic and NTLM authentication methods are supported. Graphs and reports are shown in real-time at different levels of detail, thus helping to manage the testing process.

Download the free 30-day trial!


 
WEB HOSTING
E Components
Ecommerce
Components
for ASP.NET
$15 Domain Name
Registration
Save $20 / year!
Buy UK Domain Names
Register Domain Names
Cheap Domain Names
Cheap Web Hosting
Best Web Hosting
PHP MySQL Hosting
Top 10 Web Hosting
UK Reseller Hosting
Web Hosting
FREE Web Hosting
WEB BUILDING
Website Templates
Flash Templates
Website Builder
Internet Business Opportunity
Custom Programming
FREE Trial or Demo
Web Content Manager
Forms,Web Alerts,RSS
Download XML editor
FREE Flash Website
FREE Web Templates
EDUCATION
US Web Design Schools
HTML Certification
JavaScript Certification
XML Certification
PHP Certification
ASP Certification
Home HOME or Top of Page Validate   Validate   W3C-WAI level A conformance icon Printer Friendly  Printer Friendly

W3Schools is for training only. We do not warrant the correctness of its content. The risk from using it lies entirely with the user.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2009 by Refsnes Data. All Rights Reserved.