Suppressing RDF mapping

(Questions from me, answers from Stéphane.)

Apologies if this is covered in the chapter or well-documented elsewhere,
but i have what i think should be a pretty common case.

haven't seen it anywhere, but it's the kind of question that should be
in a FAQ somewhere...

I'm printing a node, say a page node, and don't want it to name its creator
in RDFa (or any other potential RDF output) any more than i want to display
the 'submitted by' in HTML.

I guess most things are RDFa so no display = not there, but the has creator
and time stuff for a page is shown.

several options:

1. (best) alter the mappings of that node type using the RDF mapping
   API http://api.drupal.org/api/drupal/modules--rdf--rdf.module/group/rdf/7

2. Untick "Display author and date information." for the content type.
   (that works for me).

3. override theme function, or strip out the attribute in preprocess
   function (need to make sure it's called after rdf.module)