Part of a book

Hello list,

I would like to have differetns part in my book. So I defined a first
part like that :

 <part label="First Part">
    <title>My First part</title>
    <partinfo>
        <para>blah blah blah</para>
    </partinfo>
    <chapter>
        <title>dummy</title>
        <para>Blah blah blah</para>
    </chapter>
 </part>
 
 In the ToC, I found :
 
 First Part. My First Part......
    1. Dummy....
    
But My First Part page doesn't have the label First Part (there's only
the title), like in the ToC :

First Part. My First part.

Did I have to customize the xsl to have the label ?

Thanks in advance,
Jacques
-- 
 Pourquoi faire simple quand on peut faire compliqué ?