Triple tag

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A triple tag is a tag that uses a special syntax to define extra information about the tag, making it easier or more meaningful for interpretation by a computer program. Triple tags comprise three parts: a namespace, a predicate and a value. For example, "geo:long=123.456" is tag for the geographical longitude coordinate whose value is 123.456.

The triple tag format was first devised for geolicious in November 2004, to map del.icio.us bookmarks, and gained steam through adoption by mappr and GeoBloggers to map Flickr photos. In January 2007 Flickr introduced the term machine tag as an alternative name for the triple tag, adding some questions and answers on purpose, syntax and use.