"Machine tags" have been introduced into Flickr as generalization of things like geotagging. Machine tags are also known by many as "triple tags". These are tags with a specific syntax aimed primarily for "machine consumption" (that is, by programs) and not directly for display to the typical end-user. You can use machine values to store extra data elements for a given photo. I think that it's fair to say that most important example of such data has so far been the latitude and longitude associated with a photo. So important that Flickr ultimately introduced specialized functionality to handle this data, to take that data out of the realm of having people just shoehorning that info into tags.
I'd really like to know what uptake there has been on machine tags.
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