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The following taxonomies provide definitions of terminology relating to the translation and transliteration of contact information and to registration data directory services in general.
Contact Information as Defined in the Final Issue Report on the Translation and Transliteration of Contact Information based on the definition in the Registrar Accreditation Agreement (RAA), http://gnso.icann.org/en/issues/gtlds/transliteration-contact-final-21mar13-en.pdf:
"In the context of these issues, “contact information” is a subset of Domain Name Registration Data. It is the information that enables someone using a Domain Name Registration Data Directory Service (such as WHOIS) to contact the domain name registration holder. It includes the name, organization, and postal address of the registered name holder, technical contact, as well as administrative contact. Domain Name Registration Data is accessible to the public via a Directory Service (also known as the WHOIS service). The Registrar Accreditation Agreement (RAA 3.3.1) specifies the data elements that must be provided by registrars (via Port 43 and via web-based services) in response to a query, but it does not require that data elements, such as contact information, must be translated or transliterated."
From the Final Report of the Internationalized Registration Data Working Group 07 May 2012 at http://gnso.icann.org/en/issues/ird/final-report-ird-wg-07may12-en.pdf:
2.2 Terminology
The term “WHOIS” in the ICANN environment could refer to various components of the WHOIS system. To avoid confusion and bring precision to the discussion, we use the following terms as proposed in SAC 051.[1]
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Thin | Thick Registry: A thin registry only includes data sufficient to identify the sponsoring registrar, status of the registration, nameserver, creation, and expiration dates for a domain registration. Registrars maintain the complete set of registration data for those domains they sponsor. .COM and .NET are examples of thin registries. Thick registries maintain fields to store and display the registrant's contact information and designated administrative and technical information, in addition to sponsoring registrar and registration status information, with the DNRD usually provided by the sponsoring registrar..INFO and .BIZ are examples of thick registries.
From SAC051: SSAC Report on Domain Name WHOIS Terminology and Structure, 19 September 2011, http://www.icann.org/en/groups/ssac/documents/sac-051-en.pdf:
2. Taxonomy of Terms
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