Picture of Andy Fundinger
Re: "Admin"-Functions
One step further, let non-administrative users delete their own versions only.  That should handle multi-student Wikis, non-administrative teachers, TAs, etc.  Plus then you don't need a group check on delete necessarily.  If your rights system will allow it why don't you encourage the teachers to restrict a page rather than deleting it so that they are protected from their own mistakes. 

How much harm really comes from not supporting delete though?  Most Wikis would prefer that a page be orphaned and ignored rather than deleted.
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