For definitions, see Question 1.
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Presentation by Pitinan Kooarmornpatana / Electronic Transactions Development Agency, Thailand at APTLD on 21 Feb., 2014.
Validation is picked up in:
1. 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
2. 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