[Zope] limiting access to ZClass

Hi everyone, I've got a relatively simple news ZClass. It's a greatly simplified version of Kevin's KM|Net News. I have a question related to permissions. Each news story will fit into one of a number of categories. Examples would include sports, academics, arts, etc. I would like to make one person responsible for each category. Right now, 'category' is a property of the ZClass. What would be the best strategy to make it so that 'John Smith' can only submit news in the 'sports' category. -Tim -- Timothy Wilson | "The faster you | Check out: Henry Sibley H.S. | go, the shorter | http://slashdot.org/ W. St. Paul, MN, USA | you are." | http://linux.com/ wilson@visi.com | -Einstein | http://www.mn-linux.org/