Triple tag

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 [http://brainoff.com/weblog/2004/11/05/124 geolicious] in November 2004, to map del.icio.us bookmarks, and gained steam through adoption by [http://www.mappr.com/news/explicit_geocoding.html mappr] and [http://geobloggers.com/archives/2006/01/11/advanced-tagging-and-tripletags/ GeoBloggers] to map Flickr photos. In January 2007 Flickr introduced the term "machine tag" as an alternative name for the triple tag, adding some [http://www.flickr.com/groups/api/discuss/72157594497877875/ questions and answers on purpose, syntax and use] .

External links

* [http://www.foo.be/cgi-bin/wiki.pl/MachineTag some triple tag namespace in use] like license or language