RFC 2987 (rfc2987) - Page 2 of 6

Registration of Charset and Languages Media Features Tags

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
         (charset=utf-16);q=0.5 )

   Related standards or documents:
      "IANA Charset Registration Procedures", RFC 2978

   Considerations particular to use in individual applications,
   protocols, services, or negotiation mechanisms:
      None

   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.

   Additional information:
      None

   Name(s) & email address(es) of person(s) to contact for further
      information:
      Paul Hoffman [email protected]>

   Intended usage:
      COMMON

   Author/Change controller:
      IETF





Hoffman                     Standards Track