php-8.0.30-src/ext/dom/tests/not_well_formed4.xml

<?xml version="3.1" ?>
<!-- Unsupported version '3.1' -->
<books>
 <book>
  <title>The Grapes of Wrath</title>
  <author>John Steinbeck</author>
 </book>
 <book>
  <title>The Pearl</title>
  <author>John Steinbeck</author>
 </book>
</books>