Name
<xsl:key> — Defines an index against the current document. The element is defined with three attributes: a name, which names this index; a match, an XPath expression that describes the nodes to be indexed; and a use attribute, an XPath expression that defines the property used to create the index.
Category
Top-level element
Required Attributes
- name
Defines a name for this key.
- match
Represents an XPath expression that defines the nodes to be indexed by this key.
- use
Represents an XPath expression that defines the property of the indexed nodes that will be used to retrieve nodes from the index.
Optional Attributes
None.
Content
None. <xsl:key> is an empty element.
Appears in
<xsl:key> is a top-level element and can only appear as a child of <xsl:stylesheet>.
Defined in
XSLT section 12.2, Keys.
Example
Here is a stylesheet that defines two <xsl:key> relations against an XML document:
<?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="html" indent="yes"/> <xsl:strip-space elements="*"/> <xsl:key name="language-index" match="defn" use="@language"/> <xsl:key name="term-ids" match="term" use="@id"/> <xsl:param name="targetLanguage"/> <xsl:template match="/"> <xsl:apply-templates select="glossary"/> </xsl:template> <xsl:template match="glossary"> <html> <head> <title> <xsl:text>Glossary Listing: </xsl:text> <xsl:value-of select="key('language-index', $targetLanguage)[1]/preceding-sibling::term"/> <xsl:text> - </xsl:text> <xsl:value-of ...Get XSLT now with the O’Reilly learning platform.
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