DOCBOOK: Getting confused with docinfo

Hi!

	I'm integrating a docbook 3.0 book into another bigger. I put the book
between part tags and changed the bookinfo tags for docinfo. But now is
the problem: reading the TDG this is legal but jade complaints about it.

	This is a litte example:

<!DOCTYPE Book PUBLIC "-//Davenport//DTD DocBook V3.0//EN">
<book>    
    <title>book title</title>
    <part>
        <title>Part title</title>
        <docinfo>   
            <author>

<firstname>Nombre</firstname><surname>Apellidos</surname>
            </author>
        </docinfo>
        <chapter>
            <title>Qué rico está el jamón.</title>
            <para>
                This is a test.
            </para>
        </chapter>
    </part>
</book>

	Is wrong TDG? Am I doing something wrong? Is another better way to put
the bookinfo data in a part section?

	Thanks in advance.

-- 
	A.Ismael Olea González

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