A tag is a keyword that a user adds to an object. Tag A comment is a linguistic statement or set of statements added to an object or tag by a tagger during an act of tagging. Comment Source is the place where the object is hosted. It can be Delicious, Flickr, YouTube, etc. Source Tagging can be viewed as voting. The value of vote can be represented as the number of different taggers tagging a bookmark, the number of users indicating a resource is a favorite, or the number of users viewing a video. Vote Date is the time stamp of the tagging behavior. Format is "MmmYY" Date A tagger is a user who tags object. Tagger Tagging is the concept which is created to link other concepts. Itself does not have any real meaning Tagging Object is the thing which tagger is tagging. It can be bookmarks, photos, videos, musics, books, slides, etc. Object hasDate hasObject hasVote hasTag hasComment hasRelatedTag hasCreator hasSource