diff --git a/pmd-core/etc/xslt/cpdhtml-v2.xslt b/pmd-core/etc/xslt/cpdhtml-v2.xslt
index 0856de0739..614d0f793f 100644
--- a/pmd-core/etc/xslt/cpdhtml-v2.xslt
+++ b/pmd-core/etc/xslt/cpdhtml-v2.xslt
@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="https://pmd-code.org/schema/cpd-report">
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:cpd="https://pmd-code.org/schema/cpd-report"
+                exclude-result-prefixes="cpd">
 <!--
    PMD CPD (Copy and Paste Detector) XML to HTML transformer 
 -->
@@ -68,10 +70,10 @@
               <th>Approximate number of bytes</th>
             </tr>
             <tr>
-              <td class="SummaryNumber"><xsl:value-of select="count(//duplication)"/></td>
-              <td class="SummaryNumber"><xsl:value-of select="sum(//duplication/@lines)"/></td>
-              <td class="SummaryNumber"><xsl:value-of select="sum(//duplication/@tokens)"/></td>
-              <td class="SummaryNumber"><xsl:value-of select="sum(//duplication/@tokens) * 4"/></td>
+              <td class="SummaryNumber"><xsl:value-of select="count(//cpd:duplication)"/></td>
+              <td class="SummaryNumber"><xsl:value-of select="sum(//cpd:duplication/@lines)"/></td>
+              <td class="SummaryNumber"><xsl:value-of select="sum(//cpd:duplication/@tokens)"/></td>
+              <td class="SummaryNumber"><xsl:value-of select="sum(//cpd:duplication/@tokens) * 4"/></td>
             </tr>
           </table>
         </div>
@@ -91,7 +93,7 @@
             </tr>
           </thead>
           <tbody>
-            <xsl:apply-templates select="pmd-cpd/duplication" />
+            <xsl:apply-templates select="cpd:pmd-cpd/cpd:duplication" />
           </tbody>
       </table>
     </div>
@@ -133,7 +135,7 @@
 </xsl:template>
 
 <!-- templates -->
-<xsl:template match="pmd-cpd/duplication">
+<xsl:template match="cpd:pmd-cpd/cpd:duplication">
   <xsl:for-each select=".">
       <tr>
         <td><xsl:value-of select="@lines"/></td>
@@ -141,7 +143,7 @@
         <td>
           <table class="table table-light table-bordered table-striped table-hover">
             <tr><th>column</th><th>endcolumn</th><th>line</th><th>endline</th><th>path</th></tr>
-            <xsl:for-each select="file">
+            <xsl:for-each select="cpd:file">
               <tr>
                 <td><xsl:value-of select="@column"/></td>
                 <td><xsl:value-of select="@endcolumn"/></td>
@@ -152,7 +154,7 @@
             </xsl:for-each>
           </table>
         </td>
-        <td><pre><xsl:value-of select="codefragment"/></pre></td>
+        <td><pre><xsl:value-of select="cpd:codefragment"/></pre></td>
       </tr>
   </xsl:for-each>
 </xsl:template>
diff --git a/pmd-core/etc/xslt/cpdhtml.xslt b/pmd-core/etc/xslt/cpdhtml.xslt
index 18e2f7b5a0..97265d97c0 100644
--- a/pmd-core/etc/xslt/cpdhtml.xslt
+++ b/pmd-core/etc/xslt/cpdhtml.xslt
@@ -1,11 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Stylesheet to turn the XML output of CPD into a nice-looking HTML page -->
 <!-- $Id$ -->
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="https://pmd-code.org/schema/cpd-report" version="2.0">
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+				xmlns:cpd="https://pmd-code.org/schema/cpd-report"
+				exclude-result-prefixes="cpd" version="2.0">
 <xsl:output method="html" encoding="utf-8" doctype-system="about:legacy-compat"/>
 <xsl:param name="lines" required="yes">30</xsl:param>
 
-<xsl:template match="pmd-cpd">
+<xsl:template match="cpd:pmd-cpd">
 <html>
 	<head>
 		<meta charset="utf-8"/>
@@ -46,10 +48,10 @@
         <th>Approx # bytes</th>
       </tr>
       <tr>
-        <td class="SummaryNumber"><xsl:value-of select="count(//duplication[@lines>$lines])"/></td>
-        <td class="SummaryNumber"><xsl:value-of select="sum(//duplication[@lines>$lines]/@lines)"/></td>
-        <td class="SummaryNumber"><xsl:value-of select="sum(//duplication[@lines>$lines]/@tokens)"/></td>
-        <td class="SummaryNumber"><xsl:value-of select="sum(//duplication[@lines>$lines]/@tokens) * 4"/></td>
+        <td class="SummaryNumber"><xsl:value-of select="count(//cpd:duplication[@lines>$lines])"/></td>
+        <td class="SummaryNumber"><xsl:value-of select="sum(//cpd:duplication[@lines>$lines]/@lines)"/></td>
+        <td class="SummaryNumber"><xsl:value-of select="sum(//cpd:duplication[@lines>$lines]/@tokens)"/></td>
+        <td class="SummaryNumber"><xsl:value-of select="sum(//cpd:duplication[@lines>$lines]/@tokens) * 4"/></td>
       </tr>
     </table>
     <p/>
@@ -58,13 +60,13 @@
     <p/>
     <table>
     	<tr style="background-color: #444444; color: #DDDDDD;"><td>ID</td><td>Files</td><td>Lines</td></tr>
-    <xsl:for-each select="//duplication[@lines>$lines]">
+    <xsl:for-each select="//cpd:duplication[@lines>$lines]">
         <xsl:sort data-type="number" order="descending" select="@lines"/>
         <tr>
         	<td class="ItemNumber"><xsl:value-of select="position()"/></td>
         	<td>
         		<table>
-        			<xsl:for-each select="file">
+        			<xsl:for-each select="cpd:file">
         				<tr><td><a><xsl:attribute name="href">../src/<xsl:value-of select="@path"/>.html#<xsl:value-of select="@line"/></xsl:attribute><xsl:value-of select="@path"/></a></td><td> line <xsl:value-of select="@line"/></td></tr>
         			</xsl:for-each>
         		</table>
@@ -82,7 +84,7 @@
         				<textarea cols="100" wrap="off" class='CodeFragment' style='display:none;'>
 							<xsl:attribute name="rows"><xsl:value-of select="$lines"/></xsl:attribute>
         					<xsl:attribute name="id">frag_<xsl:value-of select="position()"/></xsl:attribute>
-        					<xsl:value-of select="codefragment"/>
+        					<xsl:value-of select="cpd:codefragment"/>
         				</textarea>
         			</td>
         		</tr></table>
diff --git a/pmd-core/src/test/resources/net/sourceforge/pmd/cpd/SampleCpdReport.xml b/pmd-core/src/test/resources/net/sourceforge/pmd/cpd/SampleCpdReport.xml
index e0e6b0c465..ce6169ae59 100644
--- a/pmd-core/src/test/resources/net/sourceforge/pmd/cpd/SampleCpdReport.xml
+++ b/pmd-core/src/test/resources/net/sourceforge/pmd/cpd/SampleCpdReport.xml
@@ -1,8 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<pmd-cpd>
+<pmd-cpd xmlns="https://pmd-code.org/schema/cpd-report"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         pmdVersion="7.3.0"
+         timestamp="2024-06-23T09:00:00+02:00"
+         version="1.0.0"
+         xsi:schemaLocation="https://pmd-code.org/schema/cpd-report https://pmd.github.io/schema/cpd-report_1_0_0.xsd">
    <duplication lines="60" tokens="75">
-      <file column="2" endcolumn="3" endline="6" line="1" path="/var/Foo.java"/>
-      <file column="4" endcolumn="5" endline="78" line="73" path="/var/Foo.java"/>
+      <file column="2" endcolumn="3" endline="6" line="1" begintoken="0" endtoken="1" path="/var/Foo.java"/>
+      <file column="4" endcolumn="5" endline="78" line="73" begintoken="0" endtoken="1" path="/var/Foo.java"/>
       <codefragment><![CDATA[code
 fragment]]></codefragment>
    </duplication>
