1<?xml version="1.0"?>
2
3<?xml-stylesheet   href="doc.xsl"
4   type="text/xsl"   ?>
5
6<!DOCTYPE doc SYSTEM "doc.dtd">
7
8<doc>Hello, world!<!-- Comment 1 --></doc>
9
10<?pi-without-data     ?>
11
12<!-- Comment 2 -->
13
14<!-- Comment 3 -->
15