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Asked: 2026-05-29T23:18:43+00:00

I have a xml called sample.xml <?xml version=1.0?> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don’t forget

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I have a xml called sample.xml

<?xml version="1.0"?>
<note>
         <to>Tove</to>
          <from>Jani</from>
          <heading>Reminder</heading>
          <body>Don't forget me this weekend!</body>
</note>

and sample.xsd to validate sample.xml

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified">

         <xs:element name="note">
                  <xs:complexType>
                           <xs:sequence>
                                    <xs:element name="to" type="xs:string"/>
                                    <xs:element name="from" type="xs:string"/>
                                    <xs:element name="heading" type="xs:string"/>
                                    <xs:element name="body" type="xs:string"/>
                           </xs:sequence>
                  </xs:complexType>
         </xs:element>

</xs:schema>

I’m trying to validate sample.xml through my php code and since there are no namespaces in sample.xml I’m adding the namespace from the php code.

<?php

error_reporting(E_ALL);
ini_set('display_errors', 'On');

$file = 'sample.xml';
$schema = 'sample.xsd';
$doc = new DOMDocument();
$doc->load($file);

$doc->createAttributeNS('http://www.w3schools.com', 'xmlns');
$doc->createAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 'xmlns:xsi');
$doc->createAttributeNS('http://www.w3schools.com sample.xsd', 'xsi:schemaLocation');

print $doc->saveXML();


if ($doc->schemaValidate($schema)) {
         print "$file is valid.\n";
} else {
         print "$file is invalid.\n";
}
?>

and when I run the code I get the following error

Fatal error: Uncaught exception ‘DOMException’ with message ‘Namespace
Error’ in /var/www/xsd/test_sample.php:20 Stack trace: #0
/var/www/xsd/test_sample.php(20):
DOMDocument->createAttributeNS(‘http://www.w3.o…&#8217;, ‘xmlns:xsi’) #1
{main} thrown in /var/www/xsd/test_sample.php on line 20

if I comment out the line $doc->createAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 'xmlns:xsi'); the code runs fine but then I’m not able to validate the xml as it says sample.xml is invalid

Can some one help me with this code?

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1 Answer

  1. Editorial Team

    First thing I would fix would be to also use appendChild on your document element. Without that, the attribute is created but not appended to your tree.

    For validation, please take a look at this link.

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