chapter/title or chapter/info/title - DB5

Hi Guys,

I'm producing docbook 5 with xmlmind, and trying to validate using a
relaxng  with xmllint.
I'm getting some validation errors related to title / info elements.

Can I use chapter/title or chapter/info/title interchangeably in
docbook 5? Is there a preferred format?

Or is the problem likely to be something else?

Thanks
Sam