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Representing Label Generation Rulesets Using XML (RFC7940) Disclosure Number: IPCOM000247161D
Original Publication Date: 2016-Aug-01
Included in the Prior Art Database: 2016-Aug-11

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Davies: AUTHOR [+2]


This document specifies a method of using Extensible Markup Language (XML) to describe Label Generation Rulesets (LGRs). LGRs are algorithms used to determine whether, and under what conditions, a given identifier label is permitted, based on the code points it contains and their context. These algorithms comprise a list of permissible code points, variant code point mappings, and a set of rules that act on the code points and mappings. LGRs form part of an administrator's policies. In deploying Internationalized Domain Names (IDNs), they have also been known as IDN tables or variant tables.

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Internet Engineering Task Force (IETF)                         K. Davies Request for Comments: 7940                                         ICANN Category: Standards Track                                     A. Freytag ISSN: 2070-1721                                              ASMUS, Inc.                                                              August 2016

             Representing Label Generation Rulesets Using XML


   This document describes a method of representing rules for validating    identifier labels and alternate representations of those labels using    Extensible Markup Language (XML).  These policies, known as "Label    Generation Rulesets" (LGRs), are used for the implementation of    Internationalized Domain Names (IDNs), for example.  The rulesets are    used to implement and share that aspect of policy defining which    labels and Unicode code points are permitted for registrations, which    alternative code points are considered variants, and what actions may    be performed on labels containing those variants.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Davies & Freytag             Standards Track                    [Page 1]
 RFC 7940            Label Generation Rulesets in XML         August 2016

 Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................4

   2. Design Goals ................................................