XPath Functions

XPath contains a function library for converting data.

XPath Function Library

The XPath function library contains a set of core functions for converting and translating data.

Node Set Functions

Name	Description
count()	Returns the number of selected elements
id()	Selects elements by their unique ID
last()	Returns a number equal to the context size from the expression evaluation context
local-name()	Returns the local part of the expanded-name of the node in the argument node-set that is first in document order
name()	Returns the name of an element
namespace-uri()	Returns the namespace URI of the expanded-name of the node in the argument node-set that is first in document order
position()	Returns a number equal to the context position from the expression evaluation context

String Functions

Name	Description	Example & Result
concat()	Returns the concatenation of its arguments	concat('The',' ','XML') Result: 'The XML'
contains()	Returns true if the first string contains the second string, otherwise it returns false	contains('XML','X') Result: true
normalize-space()	Removes leading and trailing spaces from a string	normalize-space(' The XML') Result: 'The XML'
starts-with()	Returns true if the first string starts with the second string, otherwise it returns false	starts-with('XML','X') Result: true
string()	Converts an object to a string	string(3.14) Result: '3,14'
string-length()	Returns the number of characters in a string	string-length('Beatles') Result: 7
substring()	Returns a substring	substring('Beatles',1,4) Result: 'Beat'
substring-after()	Returns a substring after a substring	substring-after('12/10','/') Result: '10'
substring-before()	Returns a substring before a substring	substring-before('12/10','/') Result: '12'
translate()	Translate letters in a string	translate('12:30',':','!') Result: '12!30'

Number Functions

Name	Description	Example & Result
ceiling()	Returns the smallest integer that is not less than the argument	ceiling(3.14) Result: 4
floor()	Returns the largest integer that is not greater than the argument	floor(3.14) Result: 3
number()	Converts its argument to a number	number(price)
round()	Returns the integer that is closest to the argument	round(3.14) Result: 3
sum()	Returns the sum, for each node in the argument node-set, of the result of converting the string-values of the node to a number	sum(/cd/price)

Boolean Functions

Name	Description	Example & Result
boolean()	Converts its argument to Boolean
false()	Returns false	number(false()) Result: 0
lang()
not()	Returns true if its argument is false, and false otherwise	not(false())
true()	Returns true	number(true()) Result: 1

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