This is the companion wiki for machinetags.org, a place to document implementations, namespaces, machine tag theory, or whatever other machine taggy bits might catch your fancy.
Machine tags are a form of tag that add semantic structure to tagging in a way both readable to humans and computers. Also known as “triple tags”, they originated in the geohacking community as a way to encode latitude/longitude data in tag systems like http://del.icio.us and http://flickr.com.