REVERT CONTENT 
    [ DRY ] 
    OF ContentKey 
    { AND ContentKey } 
    [ ON [ ReferenceType ] ExistingReference ] 
    TO STATE 
    ( ON [ ReferenceType ] ExistingReference [ AT [ TIMESTAMP | COMMIT ] TimestampOrCommit ]
    | AT [ TIMESTAMP | COMMIT ] TimestampOrCommit
    ) 
    [ ALLOW DELETES ]