TagAssertionTime
From TagCommons
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TagAssertionTime is the point in time when a Tagging assertion is made by a person. This concept is a good example of something that would be optional in an API or data model specification. That is, only some of the tag data sources will gather assertion times. If they do, however, this is the concept.
It is conceived as a point in time rather than as a period or duration, because an assertion "x should be tagged with Y" is not something that becomes gradually true. The essential information in the assertion time is a relative ordering with all the other times.
Why gather the date at all?
First, there is useful information in who first tagged something, and the rate of tagging over time. For instance, a PR person or trend watcher would be very interested in the popularity envelopes of certain terms or things being tagged. Programs that operate on tag data from many sites could correlate them in time, tracking a propagation wave of attention to a tag or item.
Second, it is possible for people to change their minds. Including an assertion time allows an agent to infer that a tag assertion has been withdrawn (this requires combining TagAssertionTime with TagPolarity.
