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

Namestore Extension Mapping for the Extensible Provisioning Protocol (EPP)
verisign_epp-extension_namestoreext_v01

# Abstract

This document describes an Extensible Provisioning Protocol (EPP) extension mapping for routing commands to a logical registry using a sub-product identifier.

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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 logical target registry of the EPP command using a sub-product identifier [sub-product-identifier]. An EPP server can host multiple logical registries, where the client MUST route commands to the desired target logical registry.

# 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.

"namestoreExt-1.1" is used as an abbreviation for "http://www.verisign-grs.com/epp/namestoreExt-1.1". The XML namespace prefix "namestoreExt" 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 object mappings, like the EPP domain name mapping [RFC5731]. The use of the EPP domain name mapping [RFC5731] throughout the document is used strictly as an example since the Namestore Extension MAY be used with any EPP object mapping. Only those new elements are described here.

# 2.1. Sub-Product Identifier

The sub-product identifier is used to identify the target logical registry that the EPP command is intended for. The valid set of sub-product identifiers is up to server policy. The server MUST validate the sub-product identifier and route the EPP command to the logical registry that matches the sub-product identifier.

# 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 with the Namestore Extension.

# 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 defines additional elements to extend the EPP <check> command and response to be used in conjunction with the EPP object mappings, like the EPP domain name mapping [RFC5731].

The EPP <check> command is extended to include target logical registry. In addition to the EPP command elements defined in the EPP object mappings, like the EPP domain name mapping [RFC5731], the command MUST contain the <extension> element. The <extension> element MUST contain a child <namestoreExt:namestoreExt> element that contains the following child elements:

<namestoreExt:subProduct>
  element MUST contain a sub-product identifier specifying the target logical registry.

Example <check> command with the Namestore Extension:

    C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
    C:  <command>
    C:    <check>
    C:      <domain:check
    C:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
    C:        <domain:name>EXAMPLE1.TLD</domain:name>
    C:        <domain:name>EXAMPLE2.TLD</domain:name>
    C:        <domain:name>EXAMPLE3.TLD</domain:name>
    C:      </domain:check>
    C:    </check>
    C:    <extension>
    C:      <namestoreExt:namestoreExt
    C:       xmlns:namestoreExt=
    C:       "http://www.verisign-grs.com/epp/namestoreExt-1.1">
    C:         <namestoreExt:subProduct>TLD</namestoreExt:subProduct>
    C:      </namestoreExt:namestoreExt>
    C:    </extension>
    C:    <clTRID>ABC-12345</clTRID>
    C:  </command>
    C:</epp>

When a <check> command has been successfully processed, the response MUST contain the elements defined in the EPP object mapping. In addition, the EPP <extension> element MUST contain a child <namestoreExt:namestoreExt> element that contains the same <namestoreExt:subProduct> element that was passed in the <check> command.

Example <check> response with the Namestore Extension:

    S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
    S:  <response>
    S:    <result code="1000">
    S:      <msg>Command completed successfully</msg>
    S:    </result>
    S:    <resData>
    S:      <domain:chkData
    S:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
    S:        <domain:cd>
    S:          <domain:name avail="1">EXAMPLE1.TLD</domain:name>
    S:        </domain:cd>
    S:        <domain:cd>
    S:          <domain:name avail="0">EXAMPLE2.TLD</domain:name>
    S:          <domain:reason>In use</domain:reason>
    S:        </domain:cd>
    S:        <domain:cd>
    S:          <domain:name avail="1">EXAMPLE3.TLD</domain:name>
    S:        </domain:cd>
    S:      </domain:chkData>
    S:    </resData>
    S:    <extension>
    S:      <namestoreExt:namestoreExt
    S:       xmlns:namestoreExt=
    S:       "http://www.verisign-grs.com/epp/namestoreExt-1.1">
    S:         <namestoreExt:subProduct>TLD</namestoreExt:subProduct>
    S:      </namestoreExt:namestoreExt>
    S:    </extension>
    S:    <trID>
    S:      <clTRID>ABC-12345</clTRID>
    S:      <svTRID>54321-XYZ</svTRID>
    S:    </trID>
    S:  </response>
    S:</epp>

When a <check> command has failed, the response MUST contain the elements defined in the EPP object mapping. In addition, if the command response code is 2306 "Parameter value policy error", the EPP <extension> element MAY have a child <nsExtErrData> element that contains the following child elements:

<namestoreExt:msg>
  element MUST containing a human-readable description of the error. The error code of the error MUST be identified with a "code" attribute. The language of the error is identified via an OPTIONAL "lang" attribute. If not specified, the default attribute value MUST be "en" (English). The "code" value of "1" with the error text "Invalid sub-product" indicates that the server does not support the specified sub-product identifier.

Example <check> error response with the Namestore Extension:

    S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
    S:  <response>
    S:    <result code="2306">
    S:      <msg>Parameter value policy error</msg>
    S:    </result>
    S:    <extension>
    S:      <namestoreExt:nsExtErrData
    S:        xmlns:namestoreExt=
    S:        "http://www.verisign-grs.com/epp/namestoreExt-1.1">
    S:        <namestoreExt:msg code="1">
    S:          Invalid sub-product
    S:        </namestoreExt:msg>
    S:      </namestoreExt:dstErrData>
    S:    </extension>
    S:    <trID>
    S:      <clTRID>ABC-12345</clTRID>
    S:      <svTRID>54321-XYZ</svTRID>
    S:    </trID>
    S:  </response>
    S:</epp>

# 3.1.2. EPP <info> Command

This extension defines additional elements to extend the EPP <info> command and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 3.1.3. EPP <transfer> Command

This extension defines additional elements to extend the EPP <transfer> command and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 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 and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 3.2.2. EPP <delete> Command

This extension defines additional elements to extend the EPP <delete> command and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 3.2.3. EPP <renew> Command

This extension defines additional elements to extend the EPP <renew> command and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 3.2.4. EPP <transfer> Command

This extension defines additional elements to extend the EPP <transfer> command and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 3.2.5. EPP <update> Command

This extension defines additional elements to extend the EPP <update> command and response in the same fashion as defined for the EPP <check> Command [checkCommand].

# 4. Formal Syntax

One schema is presented here that is the EPP Namestore 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. Namestore Extension Schema

    BEGIN
    <?xml version="1.0" encoding="UTF-8"?>
    <schema targetNamespace=
       "http://www.verisign-grs.com/epp/namestoreExt-1.1"
       xmlns="http://www.w3.org/2001/XMLSchema"
       xmlns:namestoreExt=
         "http://www.verisign-grs.com/epp/namestoreExt-1.1"
       elementFormDefault="qualified">
      <annotation>
        <documentation>
          Extensible Provisioning Protocol v1.0 Namestore
          extension schema for destination registry routing.
         </documentation>
      </annotation>
      <!-- General Data types. -->
      <simpleType name="subProductType">
        <restriction base="token">
          <minLength value="1"/>
          <maxLength value="64"/>
        </restriction>
      </simpleType>
      <complexType name="extAnyType">
        <sequence>
          <any namespace="##other" maxOccurs="unbounded"/>
        </sequence>
      </complexType>
      <!-- Child elements found in EPP commands and responses. -->
      <element name="namestoreExt"
        type="namestoreExt:namestoreExtType"/>
      <!-- Child elements of the <product> command. -->
      <complexType name="namestoreExtType">
        <sequence>
          <element name="subProduct"
            type="namestoreExt:subProductType"/>
        </sequence>
      </complexType>
      <!-- Child response elements. -->
      <element name="nsExtErrData"
        type="namestoreExt:nsExtErrDataType"/>

      <!-- <prdErrData> error response elements. -->
      <complexType name="nsExtErrDataType">
        <sequence>
          <element name="msg" type="namestoreExt:msgType"/>
        </sequence>
      </complexType>
      <!-- <prdErrData> <msg> element. -->
      <complexType name="msgType">
        <simpleContent>
          <extension base="normalizedString">
                <attribute name="code"
                  type="namestoreExt:prdErrCodeType"
                use="required"/>
            <attribute name="lang" type="language"
              default="en"/>
          </extension>
        </simpleContent>
      </complexType>
      <!-- <prdErrData> error response codes. -->
      <simpleType name="prdErrCodeType">
        <restriction base="unsignedShort">
          <enumeration value="1"/>
        </restriction>
      </simpleType>
    <!-- End of schema. -->
    </schema>
    END

# 5. Change History

# 5.1. Version 01

1. Initial version of Internet-Draft format of the EPP Namestore Extension, version 1.2.

# 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