> I'd like a more structured approach as provided within a 
> book, but which one?
> 
> I know that Jeni Tennison has released one :
> http://www.amazon.co.uk/exec/obidos/ASIN/0764569090
> 
> Mike Kay has also released one :
> http://www.amazon.co.uk/exec/obidos/ASIN/0764569090
> 

I think Jeni attempts to introduce the language step by step to the
beginner, I try more to provide a comprehensive reference that you will want
on your desk however long you have been using the language.

Michael Kay
http://www.saxonica.com/