Animal ID discussion document
I’ve just posted a discussion document on Animal Identification at http://www.rezare.co.nz/Media/Default/data-standards/DINDS-Animal-Identification-Discussion-2013-04-16.pdf
The same information is also in our Wiki here at W3C for discussion and comment. If you are browsing this site and have an opinion, I encourage you to register and provide feedback.
Andrew,
This, in my opinion is a good approach and should be relatively easily achievable for all devices and registers.