TagRating
From TagCommons
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TagRating, previously called TagPolarity, is a vote about the assertion that the TagLabel should be associated with the TaggedItem. It is an extension of the Tagging relation in that it qualifies the direction and magnitude of association between an item and a label. In a data model, TagPolarity might be represented as three-valued field on a record representing a tag assertion (positive, negative, and neutral). For example, a positive vote for a tag association would be "Fred says that video-465 should be tagged as 'offensive'". A negative vote against would be of the form "Mary says that video-465 should not be tagged as 'offensive'". A neutral vote would be "Anil is indifferent about whether video-465 should be tagged as 'offensive'". In this conceptualization, if a tag source does not support the notion of rating it means that the rating can be assumed to be positive.
TagRating might also be used to counter tag spam, as in Use Case 3: Social Re-Search Using Tag Data. For example, a spammer who is trying to sell snake oil might use a popular tagging service to assert that the snake oil site should be tagged with a popular label such as "love". Others who discover the fraud could then use the social tagging service to negative tag the snake oil site, asserting that it has nothing to do with "love".
As is the custom with voting and rating, each Tagger only gets one TagRating vote on each TagLabel/TaggedItem pair. If a series of Taggings are recorded by the same Tagger about the same TaggedItem using the same TagLabel and TagRating, then no new information is gained. For example, Mary's opinion about the video can be recorded several times as tag data, but her repeated cries of protest do not increase the value of her TagRating on the issue. If, however, the TagAssertionTime is also known, and the TagRating changes over time in some data stream, then it is possible to represent a Tagger changing their mind, replacing a vote in one direction with one in the other. Similarly, it follows that if a Tagger first asserts a positive rating for a Tagging, then a neutral rating, it means that the positive Tagging association is withdrawn.
