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XSLT Functions

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XQuery 1.0, XPath 2.0, and XSLT 2.0 share the same functions library.


XSLT Functions

XSLT includes over 100 built-in functions. There are functions for string values, numeric values, date and time comparison, node and QName manipulation, sequence manipulation, Boolean values, and more.

Note The default prefix for the function namespace is fn:

Note The URI of the function namespace is: http://www.w3.org/2005/xpath-functions

Tip: Functions are often called with the fn: prefix, such as fn:string(). However, since fn: is the default prefix of the namespace, the function names do not need to be prefixed when called.

The reference of all the built-in XSLT 2.0 functions is located in our XPath tutorial.

In addition, there are the following built-in XSLT functions:

Name Description
current() Returns the current node
document() Used to access the nodes in an external XML document
element-available() Tests whether the element specified is supported by the XSLT processor
format-number() Converts a number into a string
function-available() Tests whether the function specified is supported by the XSLT processor
generate-id() Returns a string value that uniquely identifies a specified node
key() Returns a node-set using the index specified by an <xsl:key> element
system-property() Returns the value of the system properties
unparsed-entity-uri() Returns the URI of an unparsed entity

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