+* "`user(username)`" - tests whether a modification is being made by a
+ user with the specified username. If openid is enabled, an openid can also
+ be put here.
+* "`admin()`" - tests whether a modification is being made by one of the
+ wiki admins.
+* "`ip(address)`" - tests whether a modification is being made from the
+ specified IP address.
+* "`postcomment(glob)`" - matches only when comments are being
+ posted to a page matching the specified glob