use docbook5 with xsltproc

Hi,

Dokbook is new to me and I don't understand the output of xsltproc. Unfortunately, I can't 
find a suitable answer or example on the Internet.

I have the following docbook example:

/<book xmlns='http://docbook.org/ns/docbook'>/
/    <title>An Example Book</title>/
/    <titleabbrev>Example</titleabbrev>/
/    <info>/
/        <legalnotice><para>No notice is required.</para></legalnotice>/
/        <author><personname>/
/                <firstname>Norman</firstname><surname>Walsh</surname>/
/                </personname></author>/
/    </info>/
/    /
/    <dedication>/
/        <para>This book is dedicated to you./
/        </para>/
/    </dedication>/
/    /
/    <preface><title>Foreword</title>/
/    <para>Some content is always required./
/    </para>/
/    </preface>/
/    /
/    <chapter><title>A Chapter</title>/
/        <para>Content is required in chapters too./
/        </para>/
/    </chapter>/
/    /
/    <appendix><title>Optional Appendix</title>/
/    <para>Appendixes are optional./
/    </para>/
/    </appendix>/
/</book>/

When I convert the docbook xls file to html with xsltproc I get following message:

/xsltproc --output test.html /usr/share/xml/docbook/xsl-stylesheets-1.79.2/xhtml5/
docbook.xsl Test_book.xml /





From the research on the Internet I suspect that the stylesheet is not compatible with 
docbook5.

What am I doing wrong?

Thanks in advance
Pierre