From http://www.w3schools.com (Copyright Refsnes Data)
The following reference library defines the functions required for XPath 2.0, XQuery 1.0 and XSLT 2.0.
The default prefix for the function namespace is fn:, and the URI is:
http://www.w3.org/2005/02/xpath-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 |
| 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 |
| 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') |
| fn:abs(num) | Returns the absolute value of the argument Example:
abs(3.14) Example: abs(-3.14) |
| fn:ceiling(num) | Returns the smallest integer that is greater than the number argument
Example: ceiling(3.14) |
| fn:floor(num) | Returns the largest integer that is not greater than the number argument
Example: floor(3.14) |
| fn:round(num) | Rounds the number argument to the nearest integer Example: round(3.14) |
| fn:round-half-to-even() | Example: round-half-to-even(0.5) Result: 0 Example: round-half-to-even(1.5) Example: round-half-to-even(2.5) |
| 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) |
| 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) |
| fn:string-to-codepoints(string) | Returns a sequence of code points from a string Example:
string-to-codepoints("Thérèse") |
| 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') |
| fn:concat(string,string,...) | Returns the concatenation of the strings Example: concat('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!'), ' ') Example: string-join(('We', 'are', 'having', 'fun!')) Example:string-join((), 'sep') |
| 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) Example: substring('Beatles',2) |
| 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') |
| 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 ') |
| fn:normalize-unicode() | |
| fn:upper-case(string) | Converts the string argument to upper-case Example: upper-case('The XML') |
| fn:lower-case(string) | Converts the string argument to lower-case Example: lower-case('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') Example: translate('12:30','03','54') Example: translate('12:30','0123','abcd') |
| 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()) Example: escape-uri ("http://example.com/~bébé", false()) |
| fn:contains(string1,string2) | Returns true if string1 contains string2, otherwise it
returns false Example: contains('XML','XM') |
| fn:starts-with(string1,string2) | Returns true if string1 starts with string2, otherwise it returns false
Example: starts-with('XML','X') |
| fn:ends-with(string1,string2) | Returns true if string1 ends with string2, otherwise it returns false
Example: ends-with('XML','X') |
| fn:substring-before(string1,string2) | Returns the start of string1 before string2 occurs in it
Example: substring-before('12/10','/') |
| fn:substring-after(string1,string2) | Returns the remainder of string1 after string2 occurs in it
Example: substring-after('12/10','/') |
| fn:matches(string,pattern) | Returns true if the string argument matches the pattern,
otherwise, it returns false Example: matches("Merano", "ran") |
| 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: 'Bea Itaia' |
| fn:tokenize(string,pattern) | Example: tokenize("XPath is fun", "\s+") Result: ("XPath", "is", "fun") |
| Name | Description |
| fn:resolve-uri(relative,base) |
| 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()) |
| fn:true() | Returns the boolean value true Example: true() |
| fn:false() | Returns the boolean value false Example: false() |
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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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")) |
| 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 |
| 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() |
| 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 Example: Lang("de") is false for |
| 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 |
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) Example: index-of (("a", "dog", "and", "a", "duck"), "a") Example: index-of ((15, 40, 25, 40, 10), 18) |
| 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) Example: remove(("ab", "cd", "ef"), 1) Example: remove(("ab", "cd", "ef"), 4) |
| 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)) |
| 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)) |
| fn:distinct-values((item,item,...),collation) | Returns only distinct (different) values Example:
distinct-values((1, 2, 3, 1, 2)) |
| 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") Example: insert-before(("ab", "cd"), 1, "gh") Example: insert-before(("ab", "cd"), 2, "gh") Example: insert-before(("ab", "cd"), 5, "gh") |
| fn:reverse((item,item,...)) | Returns the reversed order of the items specified
Example: reverse(("ab", "cd", "ef")) Example: reverse(("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, $item3,...), 3) Example: subsequence(($item1, $item2, $item3, ...), 2, 2) |
| 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)) |
| fn:max((arg,arg,...)) | Returns the argument that is greater than the others
Example: max((1,2,3)) Example: max(('a', 'k')) |
| fn:min((arg,arg,...)) | Returns the argument that is less than the others
Example: min((1,2,3)) Example: min(('a', 'k')) |
| 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) |
| Name | Description |
| fn:position() | Returns the index position of the node that is currently being processed
Example: //book[position()<=3] |
| fn:last() | Returns the number of items in the processed node list
Example: //book[last()] |
| 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 |
From http://www.w3schools.com (Copyright Refsnes Data)