In this way, the tags can be more accurate, but the owner of the work has to approve the proposed tags. Of course, other people can also suggest to the author to delete certain tags, which also needs to be approved by the owner of the work. When the author receives a tag suggestion for one of his/her works, (s)he will get a message prompt in "Notification", but this type of notification will be assigned to the "Tag Suggestion" category.