I have sent you an email about XPRL which may be helpful in the endevour.

The key elements are here: http://www.xprl.org/content/standard_A1C.rhtm

This will allow you to extend PRX to cover other domains of practice. The key is that AJAX applications for the PR industry are going to be really important. The media is repurposing news (paper, blogs, vid/podcasts, email, newsletters etc) so being able to offer a range of components of content for journalists to mashup (or publishers to port from orginator to public) will be a big asset.

I will make the guides available on my blog later today.