June 2008
Intermediate to advanced
986 pages
27h 8m
English
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Name
<xsl:fallback>
Defines a template that should be used when an XSLT processor finds an instruction in the stylesheet that it can’t process. Fallback processing can be triggered by an extension element that relies on code that can’t be found. It is also invoked when an XSLT 1.0 processor working in forward processing mode encounters an XSLT 2.0 element.
Category
Instruction.
Required Attributes
None.
Optional Attributes
None.
Content
An XSLT template.
Appears in
<xsl:fallback> appears
inside a template.
Defined in
[1.0] XSLT section 15, “Fallback.”
[2.0] XSLT section 18, “Extensibility and Fallback.”
Example
Here is a stylesheet that uses <xsl:fallback> to terminate the
transformation if an extension element can’t be found:
<?xml version="1.0"?> <!-- fallback.xsl --> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:db="xalan://DatabaseExtension" extension-element-prefixes="db"> <xsl:output method="html"/> <xsl:template match="/"> <html> <head> <title><xsl:value-of select="report/title"/></title> </head> <body> <h1><xsl:value-of select="report/title"/></h1> <xsl:for-each select="report/section"> <h2><xsl:value-of select="title"/></h2> <xsl:for-each select="dbaccess"> <db:accessDatabase> <xsl:fallback> <p>Sorry, the database library is not available!</p> </xsl:fallback> </db:accessDatabase> </xsl:for-each> </xsl:for-each> </body> </html> </xsl:template> </xsl:stylesheet>
We’ll use this stylesheet against this XML document:
<?xml version="1.0"?>
<!-- use-db.xml ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.