Internet Draft Paul Hoffman draft-hoffman-char-lang-media-00.txt Internet Mail Consortium April 24, 1999 Expires in six months Registration of Charset and Languages Media Features Tags Status of this memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Abstract This document contains the registration for two media features: "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 [TAG-REG]. 1. Registration for charset To: media-feature-tags@apps.ietf.org (Media feature tags mailing list) Subject: Registration of media feature tag charset Media feature tag name: charset ASN.1 identifier associated with feature tag: None requested Summary of the media feature indicated by this feature tag: Ability to display particular charsets as defined in [CHARSET] Values appropriate for use with this feature tag: [x] 2. The feature has an associated numeric or enumerated value. [x] 2e. String (equality relationship) (Only for case 2) Detailed description of the feature value meaning, and of the format and meaning of the feature tag values for the alternative results. The values are strings as defined in [CHARSET]. The values can only be compared for equality. The feature tag is intended primarily for use in the following applications, protocols, services, or negotiation mechanisms: Any protocol that used media tags Examples of typical use: (| (charset=utf-8);q=1.0 (charset=iso-8859-1);q=.9 (charset=utf-16);q=.5 ) Related standards or documents: "IANA Charset Registration Procedures", RFC 2278 Considerations particular to use in individual applications, protocols, services, or negotiation mechanisms: None Interoperability considerations: None 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. Additional information: None Name(s) & email address(es) of person(s) to contact for further information: Paul Hoffman <phoffman@imc.org> Intended usage: COMMON Author/Change controller: Paul Hoffman <phoffman@imc.org> Requested IANA publication delay: None Other information: None 2. Registration for language To: media-feature-tags@apps.ietf.org (Media feature tags mailing list) Subject: Registration of media feature tag language Media feature tag name: language ASN.1 identifier associated with feature tag: None requested Summary of the media feature indicated by this feature tag: Ability to display particular human languages as defined in [LANG]. Note that "display" in this case will most often mean speech by a computer. Values appropriate for use with this feature tag: [x] 2. The feature has an associated numeric or enumerated value. [x] 2e. String (equality relationship) (Only for case 2) Detailed description of the feature value meaning, and of the format and meaning of the feature tag values for the alternative results. The values are strings as defined in [LANG]. The values can only be compared for equality. As described in [LANG], language tags are always handled as a single token, and "subtags" are not used for comparison. The feature tag is intended primarily for use in the following applications, protocols, services, or negotiation mechanisms: Any protocol that used media tags Examples of typical use: (| (language=no-nynorsk);q=1.0 (language=no-bokmaal);q=.9 (language=i-sami-no);q=.5 ) Related standards or documents: "Tags for the Identification of Languages", RFC 1766 Considerations particular to use in individual applications, protocols, services, or negotiation mechanisms: None Interoperability considerations: None Security considerations: If it is known that there is a security bug in the display of a particular language in a particular environment, knowing that a device can accept that language may slightly help an attacker. Additional information: None Name(s) & email address(es) of person(s) to contact for further information: Paul Hoffman <phoffman@imc.org> Intended usage: COMMON Author/Change controller: Paul Hoffman <phoffman@imc.org> Requested IANA publication delay: None Other information: None 3. Security Considerations The security considerations are listed in the two registrations above. 4. References [CHARSET] "IANA Charset Registration Procedures", RFC 2278 [LANG] "Tags for the Identification of Languages", RFC 1766 [TAG-REG] "Media Feature Tag Registration Procedure", RFC 2506 5. Changes Between Versions of This Document The document is new, so there are no changes. 6. Author Contact Information Paul Hoffman Internet Mail Consortium 127 Segre Place Santa Cruz, CA 95060 USA phoffman@imc.org