I agree, same as html.
But on another note I can't seem to find a clear answer about duplicate content and PDFs . Obviously you wouldnt use the same content on all you tier 1 html properties but is it ok to use the same PDF for your doc sumbimissions?
I have seen several people say it's better to use different content - but at the same timelets take a real world example... when say a medical-research PDF is published isn't that picked up by a bunch of say medical-journal database sites?
I have someone doing some work on one of my sites, and they seem to think there's no dup content issues with PDF's.
Opinions? Or better yet, definitive answers from experienced members?