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Asked: 2026-05-15T15:41:07+00:00

I’m trying to use XSLT to create Edge Side Includes html blocks. Here is

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I’m trying to use XSLT to create Edge Side Includes html blocks.

Here is a sample XSLT

<xsl:stylesheet version="1.0" 
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                xmlns:esi="http://www.edge-delivery.org/esi/1.0" 
                exclude-result-prefixes="xsl esi">

    <xsl:output method="html" 
                media-type="text/html" 
                version="1.0" 
                encoding="UTF-8" 
                indent="no" 
                omit-xml-declaration="yes"/>

    <xsl:template match="/">
        <esi:vars>
            <xsl:text>some text goes here</xsl:text>
        </esi:vars>
    </xsl:template>

</xsl:stylesheet>

While the transformation works per-se, the output is this:

<esi:vars xmlns:esi="http://www.edge-delivery.org/esi/1.0">some text goes here</esi:vars>

problem is, the xmlns:esi attribute horribly breaks ESI execution.
If I remove the attribute manually (eg: open the HTML and delete it, saving the code block again) everything works fine.

Question: How can I remove the xmlns:esi from the HTML output?
I tried including it in exclude-results-prefixes, but didn’t work.

Sample output that WILL work:

<esi:vars>some text goes here</esi:vars>
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1 Answer

  1. Editorial Team

    Question: How can I remove the
    xmlns:esi from the HTML output? I
    tried including it in
    exclude-results-prefixes, but didn’t
    work.

    XSLT with output method xml cannot produce non-well-formed XML.

    When the namespace declaration is deleted manually, the "esi:" prefix becomes not bound to any namespace and thie whole document thus becomes non-well-formed.

    According to the ESI Spec., the esi namespace must typically be declared in the top element (<html>) of the document.

    Try this:

    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:esi="http://www.edge-delivery.org/esi/1.0">
<xsl:output indent="no" omit-xml-declaration="yes"/>

<xsl:template match="/">
   <html xmlns:esi="http://www.edge-delivery.org/esi/1.0">
    <esi:vars>
        <xsl:text>some text goes here</xsl:text>
    </esi:vars>
    </html>
</xsl:template>

</xsl:stylesheet>

    which produces:

    <html xmlns:esi="http://www.edge-delivery.org/esi/1.0">
    <esi:vars>some text goes here</esi:vars>
</html>
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