XSLTProcessor works with \DOMDocument, but fails with \Dom\XMLDocument

[jacekkow]

Description

The following code:

<?php
$dom = \Dom\XMLDocument::createFromFile("http://crd.gov.pl/wzor/2025/06/25/13775/styl.xsl");
var_dump(new \XSLTProcessor()->importStylesheet($dom));

Resulted in this output:

PHP Warning:  XSLTProcessor::importStylesheet(): error in /tmp/xmldocument.php on line 3
PHP Warning:  XSLTProcessor::importStylesheet(): xsltCompileStepPattern : no namespace bound to prefix tns in /tmp/xmldocument.php on line 3
PHP Warning:  XSLTProcessor::importStylesheet(): compilation error: file http://crd.gov.pl/wzor/2025/06/25/13775/styl.xsl line 34 element template in /tmp/xmldocument.php on line 3
PHP Warning:  XSLTProcessor::importStylesheet(): xsltCompilePattern : failed to compile 'tns:Faktura' in /tmp/xmldocument.php on line 3
bool(false)

But I expected this output instead:

bool(true)

Which is what \DOMDocument version outputs:

<?php
$dom = new \DOMDocument;
$dom->load("http://crd.gov.pl/wzor/2025/06/25/13775/styl.xsl");
var_dump(new \XSLTProcessor()->importStylesheet($dom)); // works!

PHP Version

PHP 8.5.3 (cli) (built: Feb 13 2026 15:50:47) (NTS)
Copyright (c) The PHP Group
Built by Debian
Zend Engine v4.5.3, Copyright (c) Zend Technologies
    with Zend OPcache v8.5.3, Copyright (c), by Zend Technologies

Operating System

Debian 13

[ndossche]

I can't seem to access the URL, keeps trying to connect to crd.gov.pl to no avail. Is it geo-blocked?

[jacekkow]

@ndossche: didn't expect it to be geo-blocked, but you can use this snippet as style.xsl to trigger the same error:

<?xml version="1.0" encoding="UTF-8"?><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:tns="http://crd.gov.pl/wzor/2025/06/25/13775/" version="1.0">
	<xsl:template match="tns:Faktura">
	</xsl:template>
</xsl:stylesheet>

error:

PHP Warning:  XSLTProcessor::importStylesheet(): error in /tmp/xmldocument.php on line 3
PHP Warning:  XSLTProcessor::importStylesheet(): xsltCompileStepPattern : no namespace bound to prefix tns in /tmp/xmldocument.php on line 3
PHP Warning:  XSLTProcessor::importStylesheet(): compilation error: file file:///tmp/style.xsl line 2 element template in /tmp/xmldocument.php on line 3
PHP Warning:  XSLTProcessor::importStylesheet(): xsltCompilePattern : failed to compile 'tns:Faktura' in /tmp/xmldocument.php on line 3
bool(false)

[ndossche]

#21371 Should fix this. It'd be great if you could test this somehow on the entire xsl document 🙂