XQuery 1.0, XPath 2.0, and XSLT 2.0 share the same functions library.
A list of different types of XQuery functions:
Functions are specified with fn: prefix. For example: fn:string(). But fn: is the default prefix of the namespace, so you do not need to be prefix fn when function is called.
| Index | Name | Description |
|---|---|---|
| 1) | fn:node-name(node) | It is used to return the node-name of the argument node. |
| 2) | fn:nilled(node) | It is used to return a Boolean value indicating whether the argument node is nil. |
| 3) | fn:data(item.item,...) | It is used to take a sequence of items and return a sequence of atomic values. |
| 4) | fn:base-uri() fn:base-uri(node) |
It returns the value of the base-uri property of the current or specified node. |
| 5) | fn:document-uri(node) | It returns the value of the document-uri property for the specified node. |
| Index | Name | Description |
|---|---|---|
| 1) | 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. |
| 2) | fn:trace(value,label) | it is used to debug queries. |
| Index | Name | Description |
|---|---|---|
| 1) | fn:abs(num) | It returns the absolute value of the argument. For example: abs(3.14) Result: 3.14 |
| 2) | fn:abs(num) | It returns the absolute value of the argument For example: abs(3.14) Result: 3.14 Example: abs(-3.14) Result: 3.14 |
| 3) | fn:ceiling(num) | It returns the smallest integer that is greater than the number argument For example: ceiling(3.14) Result: 4 |
| 4) | fn:floor(num) | It returns the largest integer that is not greater than the number argument For example: floor(3.14) Result: 3 |
| 5) | fn:round(num) | It is used to round of the number argument to the nearest integer For example: round(3.14) Result: 3 |
| 6) | 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 |
There is a lot of string functions used in XQuery but here we are using the selected one.
A list of commonly used string manipulation functions of XQuery:
| Index | Name | Description |
|---|---|---|
| 1) | string-length($string as xs:string) as xs:integer |
It returns the length of the string. |
| 2) | concat($input as xs:anyatomictype?) as xs:string | It returns the concatenated string as output. |
| 3) | string-join($sequence as xs:string*, $delimiter as xs:string) as xs:string | It returns the combination of items in a sequence separated by a delimiter. |
| Index | Name | Description |
|---|---|---|
| 1) | fn:boolean(arg) | It is used to return a Boolean value for a number, string, or node-set. |
| 2) | fn:not(arg) | It specifies that the argument is first reduced to a Boolean value by applying the Boolean() function. It returns true if the Boolean value is false, and false if the Boolean value is true. For example: not(true()) Result: false |
| 3) | fn:true() | It returns the Boolean value true Example: true() Result: true |
| 4) | fn:false() | It returns the Boolean value false For example: false() Result: false |
There are a lot of time and date function supported in XQuery but here, we are providing the selected one.
A list of some commonly used date and time functions provided by XQuery:
| Index | Name | Description |
|---|---|---|
| 1) | current-date() | It is used to return the current date. |
| 2) | current-time() | It is used to return the current time. |
| 3) | current-datetime() | It is used to return both the current date and the current time. |
