For definitions, see Question 1.
...
Validation is picked up in:
1. http://blog.icann.org/2014/03/a-model-for-exploring-whois-accuracy/
by margie Milam
2. the WHOIS Accuracy Program Specification part of the 2013 Registrar Accreditation Agreement:
http://www.icann.org/en/resources/registrars/raa/approved-with-specs-27jun13-en.htm#whois-accuracy
23. the Status update report from the EWG on gTLD Directory Services:
www.icann.org/en/groups/other/gtld-directory-services/status-update-11nov13-en.pdf p.22-30