Easy Tutorial
Xsl Browsers El Include Xsl Functions El Preserve Space Index El Fallback El Output El For Each Xsl Func Formatnumber El Otherwise El Namespace Alias Func Generateid El Import El Text El Copy Of Func Functionavailable Func Key El Choose Func Systemproperty El Variable Xsl Templates Xsl For Each Xsl Examples El Processing Instruction Func Elementavailable El Attribute El Param El Element El Key El Apply Imports El Attributeset Xsl Client Func Document Xsl Sort El Comment El When El Template El Call Template Xsl Tutorial Xsl Choose Xsl Server El With Param Func Current Xsl W3Celementref Func Unparsedentityuri El Message El Number Xsl Value Of El If El Value Of Xsl Intro Xsl Summary Xsl Editors Xsl If Xsl Transformation El Decimal Format El Sort El Apply Templates Xsl Languages El Stylesheet Xsl Editxml Xsl Apple Templates El Copy
❮ El Element El Apply Imports ❯

XSLT <xsl:key> Element

Definition and Usage

The <xsl:key> element is a top-level element, which can declare a named key (i.e., a name-value pair assigned to specified elements in an XML document). This key is used in the stylesheet via the key() function, helping you efficiently access assigned elements in complex XML documents.

Note: Keys do not have to be unique!

Syntax

Attributes

Attribute Value Description
name name Required. Specifies the name of the key.
match pattern Required. Defines which nodes the key is applied to.
use expression Required. Specifies the expression to use as the key value for each node.

Example 1

Suppose you have an XML file named "persons.xml":

You can define a key in the XSL file as follows:

To find the person with id="050676", use these codes (in the XSL file):

❮ El Element El Apply Imports ❯