vCard3.0规格详解与对比vCard2.1

Vcard3.0 Specs URL:http://tools.ietf.org/html/rfc2426

 Differences From vCard v2.1

   This specification has been reviewed by the IETF community. The
   review process introduced a number of differences from the [VCARD]
   version 2.1. These differences require that vCard objects conforming
   to this specification have a different version number than a vCard
   conforming to [VCARD]. The differences include the following:

        . The QUOTED-PRINTABLE inline encoding has been eliminated.
          Only the "B" encoding of [RFC 2047] is an allowed value for
          the ENCODING parameter.

        . The method for specifying CRLF character sequences in text
          type values has been changed. The CRLF character sequence in
          a text type value is specified with the backslash character
          sequence "\n" or "\N".

        . Any COMMA or SEMICOLON in a text type value must be backslash
          escaped.

        . VERSION value corresponding to this specification MUST be
          "3.0".

        . The [MIME-DIR] predefined types of SOURCE, NAME and PROFILE
          are allowed.

        . The [MIME-DIR] VALUE type parameter for value data typing is
          allowed. In addition, there are extensions made to these type