Registration of Charset and Languages Media Features Tags (RFC2987)
Original Publication Date: 2000-Nov-01
Included in the Prior Art Database: 2001-Aug-16
Internet Society Requests For Comment (RFCs)
AbstractThis document contains the registration for two media feature tags: "charset" and "language". These media features allow specification of character sets and human languages that can be understood by devices and the devices' users. The templates in this document are derived from RFC 2506.
Network Working Group P. Hoffman Request for Comments: 2987 Internet Mail Consortium Category: Standards Track November 2000
Registration of Charset and Languages Media Features Tags
Status of this Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document contains the registration for two media feature tags: "charset" and "language". These media features allow specification of character sets and human languages that can be understood by devices and the devices' users. The templates in this document are derived from RFC 2506.
1. Registration for charset
To: firstname.lastname@example.org (Media feature tags mailing list) Subject: Registration of media feature tag charset
Media feature tag name:
ASN.1 identifier associated with feature tag:
Summary of the media feature indicated by this feature tag: Ability to display particular charsets as defined in [CHARSET]. For most devices, this media feature is usually a capability; that is, most devices cannot intelligently process text in a charset that is unknown to the device.
Hoffman Standards Track [Page 1]
RFC 2987 Charset and Languages Media Features Tags November 2000
Values appropriate for use with this feature tag: The values are tokens as defined in [CHARSET]. The values can only be compared for equality. Comparison is not case sensitive.
The feature tag is intended primarily for use in the following applications, protocols, services, or negotiation mechanisms:
Any protocol that uses media tags
Examples of typical use: (charset=utf-8);q=1.0 (charset=iso-8859-1);q=0.9
Related standards or documents:
"IANA Charset Registration Procedures", RFC 2978
Considerations particular to use in individual applications, protocols, services, or negotiation mechanisms:
Interoperability considerations: Aliases for charsets should not be used in media feature expressions because feature expression manipulation tools may convert aliases to the the principal name for the charset. Even though charset names are not case-sensitive, values should be expressed as all lowercase letters to increase the likelihood of interoperability. The "charset" capability should always be indicated in conjunction with any capability to handle textual data.
Security considerations: If it is known that there is a security bug in the display of a particular charset in a particular environment, knowing that a device can accept that charset may slightly help an attacker.
Name(s) email address(es) of person(s) to contact for further information: Paul Hoffman