Manual:Null revision

A null revision is created when certain actions are performed on pages or their revisions. The null revision has the same revision.rev_text_id as its parent. It causes the log event to be displayed in the page history. These are created by Revision::newNullRevision().

Log events that create null revisions

• Imports
• Page moves
• Page protection, unprotection, or changing protection level

Log events that do not create null revisions

• Changing visibility of deletions (RevisionDelete )
• Merges
• Page deletions
• Page restorations
• Patrol events