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XSLT generate-id() Function

XSLT generate-id() Function​

The key function returns a node-set from the document, using the index specified by an <xsl:key> element.

Syntax​

node-set key(string, object)

Input Parameters​

ParameterRequired/OptionalDescription
stringRequiredSpecifies the name of an xsl:key element
objectRequiredA string to search for

Example​

Consider the following example about a bookstore:

books.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="books.xsl"?>

<bookstore>
    <book category="children">
        <title lang="en">Harry Potter</title>
        <author>J K. Rowling</author>
        <year>2005</year>
        <price>29.99</price>
    </book>
    <book category="web">
        <title lang="en">XQuery Tips</title>
        <author>Tom Nolan</author>
        <year>2022</year>
        <price>39.99</price>
    </book>
    <book category="web">
        <title lang="en">Learn XML</title>
        <author>Tutorial Reference</author>
        <year>2022</year>
        <price>9.99</price>
    </book>
</bookstore>
books.xsl
<?xml version="1.0"  encoding="UTF-8"?>  
<xsl:stylesheet version="1.0"  
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">  
  
<xsl:key name="booklist" match="book" use="title"  />  
  
<xsl:template match="/">  
    <html>  
        <body>  
            <xsl:for-each select="key('booklist', 'Harry Potter')">  
                <p>  
                Title: <xsl:value-of select="title"  />  
                <br />  
                Author: <xsl:value-of select="author"  />  
                <br />  
                Price: <xsl:value-of select="price"  />  
                </p>  
            </xsl:for-each>  
        </body>  
    </html>  
</xsl:template>  
  
</xsl:stylesheet>

And the output is:

<html>  
    <body>  
        <p> Title: Harry Potter<br/>
        Author: J K. Rowling<br/>
        Price: 29.99</p>  
    </body>  
</html>

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