-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V3.1//EN"[]>
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
+
<book id="USB-Gadget-API">
<bookinfo>
<title>USB Gadget API for Linux</title>