XSLT Transformations & Templates (<xsl:template>)
XSLT (eXtensible Stylesheet Language Transformations) is a declarative language used to transform XML documents into HTML web pages, PDF documents, or other XML formats. It uses <xsl:template> pattern rules to match source nodes and generate output markup.
"XSLT is like an automated 3D printing mold: you pour raw molten plastic (raw XML data) into the mold (XSLT stylesheet), and it outputs a beautifully shaped consumer product (styled HTML web page)."
Deep Dive: How It Works
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">: Root of every XSLT file.
<xsl:template match="/">: Matches the root document node and defines the output skeleton.
<xsl:value-of select="path" />: Extracts the value of a node and inserts it directly into the output document.
Syntax Blueprint
<xsl:template match="/"> <html><body><h1><xsl:value-of select="catalog/title" /></h1></body></html> </xsl:template>
Transforms XML catalog title into an HTML <h1> heading.
Core Rules to Remember
Common Beginner Traps & How to Fix Them
Forgetting the XSLT namespace declaration.Why it happens: Without xmlns:xsl="http://www.w3.org/1999/XSL/Transform", parsers will not recognize xsl: tags as transformation instructions.
How to fix: Always include the standard xsl namespace on <xsl:stylesheet>.
Live Interactive Example
Hit Run Code to see it liveYour Turn: Micro Challenge
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Extract a product title with xsl:value-of
- Inside `<h2>`, use `<xsl:value-of select="product/name" />`.
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