DOCBOOK-APPS: Picking up the book title in a header element in theDSSSL?

Hi,

I want to be able to pick up the book title and subtitle and insert those
as elements in the page headers or footers ...

I can half see how to do this in DSSSL, but wondered if someone could give
me a solid pointer.



Regards
-------
Richard Sharpe, 
Samba (Team member, www.samba.org), Ethereal (Team member, www.ethereal.com)
Contributing author, SAMS Teach Yourself Samba in 24 Hours
Author, Special Edition, Using Samba