--- /dev/null
+<?xml version="1.0"?>
+<!DOCTYPE note SYSTEM "note.dtd">
+<note>
+<to>PHP User Group</to>
+<from>Shane</from>
+<heading>Reminder</heading>
+<body>Don't forget the meeting tonight!</body>
+<footer>Or I'll clobber you!</footer>
+</note>
--- /dev/null
+<?xml version="1.0" ?>
+<!ELEMENT note (to,from,heading,body)>
+<!ELEMENT to (#PCDATA)>
+<!ELEMENT from (#PCDATA)>
+<!ELEMENT heading (#PCDATA)>
+<!ELEMENT body (#PCDATA)>
\ No newline at end of file
--- /dev/null
+<?php
+
+$dom = new domDocument;
+$dom->load('note.xml');
+if (!$dom->validate('note.dtd')) {
+ print "Document note.dtd is not valid\n";
+} else {
+ print "Document note.dtd is valid\n";
+}
+
+$dom = new domDocument;
+$dom->load('note-invalid.xml');
+if (!$dom->validate('note.dtd')) {
+ print "Document note-invalid.xml is not valid\n";
+} else {
+ print "Document note-invalid.xml is valid\n";
+}
+
+?>
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