Rating System

Hi Chaps

I need to add some form of rating system for events (by admins only, not public)
I was just wondering what would be the best method/format so that other sites and engines can interpretate the RSS feed and add to their listings, i.e. google… do they use simply ‘1 - 5’ or 5 ‘excellent’
…if anyone knows of any info

thanks in advance

You need to use specific markup, such as hReview.

Overview:
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=172705

Markup formats supported by Google, Yahoo! and Bing: