| J. Gould
| VeriSign, Inc.
| December 10, 2013

IDN Language Tag for the Extensible Provisioning Protocol (EPP)
verisign_epp-extension_idn-lang_v01

# Abstract

This document describes an Extensible Provisioning Protocol (EPP) extension mapping for specifying the language tag for Internationalized Domain Name (IDN) registrations.

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# Table of Contents

# 1. Introduction

This document describes an extension mapping for version 1.0 of the Extensible Provisioning Protocol (EPP) [RFC5730]. This EPP extension mapping enables a client to specify the language tag [language-tag] for an Internationalized Domain Name (IDN) registration.

# 1.1. Conventions Used in This Document

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].

XML is case sensitive. Unless stated otherwise, XML specifications and examples provided in this document MUST be interpreted in the character case presented in order to develop a conforming implementation.

In examples, "C:" represents lines sent by a protocol client and "S:" represents lines returned by a protocol server. Indentation and white space in examples are provided only to illustrate element relationships and are not a REQUIRED feature of this protocol.

"idnLang-1.0" is used as an abbreviation for "http://www.verisign.com/epp/idnLang-1.0". The XML namespace prefix "idnLang" is used, but implementations MUST NOT depend on it and instead employ a proper namespace-aware XML parser and serializer to interpret and output the XML documents.

# 2. Object Attributes

This extension adds additional elements to the EPP domain name mapping [RFC5731]. Only those new elements are described here.

# 2.1. Language Tag

A valid language tag MUST be passed for all Internationalized Domain Name (IDN) registrations. The valid langauge tag format is defined by the XML-Schema language element. The set of valid langauge values is up to server policy.

# 3. EPP Command Mapping

A detailed description of the EPP syntax and semantics can be found in the EPP core protocol specification [RFC5730]. The command mappings described here are specifically for use in IDN registrations using a language tag [language-tag] via EPP.

# 3.1. EPP Query Commands

EPP provides three commands to retrieve object information: <check> to determine if an object is known to the server, <info> to retrieve detailed information associated with an object, and <transfer> to retrieve object transfer status information.

# 3.1.1. EPP <check> Command

This extension does not add any elements to the EPP <check> command or <check> response described in the EPP domain name mapping [RFC5731].

# 3.1.2. EPP <info> Command

This extension does not add any elements to the EPP <info> command or <info> response described in the EPP domain name mapping [RFC5731].

# 3.1.3. EPP <transfer> Command

This extension does not add any elements to the EPP <transfer> command or <transfer> response described in the EPP domain name mapping [RFC5731].

# 3.2. EPP Transform Commands

EPP provides five commands to transform objects: <create> to create an instance of an object, <delete> to delete an instance of an object, <renew> to extend the validity period of an object, <transfer> to manage object sponsorship changes, and <update> to change information associated with an object.

# 3.2.1. EPP <create> Command

This extension defines additional elements to extend the EPP <create> command described in EPP domain name mapping [RFC5731].

The EPP <create> command provides a transform operation that allows a client to create a domain object. In addition to the EPP command elements described in EPP domain name mapping [RFC5731], the command MUST contain the <extension> element. The <extension> element MUST contain a child <idnLang:tag> element that contains the value of the language tag.

Example <create> command with the IDN Language Tag extension:

    C:<?xml version="1.0" encoding="UTF-8"?>
    C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
    C:  <command>
    C:    <create>
    C:      <domain:create
    C:        xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
    C:        <domain:name>example.com</domain:name>
    C:        <domain:authInfo>
    C:          <domain:pw>2fooBAR</domain:pw>
    C:        </domain:authInfo>
    C:      </domain:create>
    C:    </create>
    C:    <extension>
    C:      <idnLang:tag
    C:        xmlns:idnLang=
    C:        "http://www.verisign.com/epp/idnLang-1.0">
    C:        ENG
    C:      </idnLang:tag>
    C:    </extension>
    C:    <clTRID>ABC-12345</clTRID>
    C:  </command>
    C: </epp>

When a <create> command has been processed successfully, the EPP <creData> element MUST contain child elements as described in EPP domain name mapping [RFC5731].

# 3.2.2. EPP <delete> Command

This extension does not add any elements to the EPP <delete> command or <delete> response described in the EPP domain name mapping [RFC5731].

# 3.2.3. EPP <renew> Command

This extension does not add any elements to the EPP <renew> command or <renew> response described in the EPP domain name mapping [RFC5731].

# 3.2.4. EPP <transfer> Command

This extension does not add any elements to the EPP <transfer> command or <transfer> response described in the EPP domain name mapping [RFC5731].

# 3.2.5. EPP <update> Command

This extension does not add any elements to the EPP <update> command or <update> response described in the EPP domain name mapping [RFC5731].

# 4. Formal Syntax

One schema is presented here that is the EPP IDN Language Tag Extension schema.

The formal syntax presented here is a complete schema representation of the object mapping suitable for automated validation of EPP XML instances. The BEGIN and END tags are not part of the schema; they are used to note the beginning and ending of the schema for URI registration purposes.

# 4.1. IDN Language Tag Extension Schema

    BEGIN
    <?xml version="1.0" encoding="UTF-8"?>
    <schema targetNamespace="http://www.verisign.com/epp/idnLang-1.0"
      xmlns:idnLang="http://www.verisign.com/epp/idnLang-1.0"
      xmlns="http://www.w3.org/2001/XMLSchema"
      elementFormDefault="qualified">

      <annotation>
        <documentation>
          Extensible Provisioning Protocol v1.0 domain name
          extension schema for IDN Lang Tag.
        </documentation>
      </annotation>

      <!--
        Child elements found in EPP commands.
       -->
      <element name="tag" type="language"/>

    <!-- End of schema. -->
    </schema>
    END

# 5. Change History

# 5.1. Version 01

1. Initial version of Internet-Draft format of the IDN Language Tag Extension, version 1.1.

# 6. Security Considerations

The mapping extensions described in this document do not provide any security services beyond those described by EPP [RFC5730] and protocol layers used by EPP. The security considerations described in these other specifications apply to this specification as well.

# 7. Normative References

[RFC2119] | Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5730] | Hollenbeck, S., "Extensible Provisioning Protocol (EPP)", STD 69, RFC 5730, August 2009.
[RFC5731] | Hollenbeck, S., "Extensible Provisioning Protocol (EPP) Domain Name Mapping", STD 69, RFC 5731, August 2009.

# Author's Address