1<?xml version="1.0"?> 2<chapter> 3 <p>a simple test</p> 4 <p>multiple tests</p> 5 <p>a diff<em>i</em>cult one</p> 6 <p><p>a span</p>n<p>ing one</p></p> 7 <p><p>and an unbal</p><empty/>anced test</p> 8 <p>for empty string <seq>123</seq></p> 9 <p id="1">a<b>b</b>c</p> 10 <p id="2"><!--X-->abc</p> 11</chapter> 12