Defines an Inline Encoding parameter. Constants are provided for all encodings specified in RFC2045.

 4.2.7 Inline Encoding

    Parameter Name: ENCODING

    Purpose: To specify an alternate inline encoding for the property
    value.

    Format Definition: The property parameter is defined by the following
    notation:

      encodingparam      = "ENCODING" "="
                           ("8BIT"
         ; "8bit" text encoding is defined in [RFC 2045]
                         / "BASE64"
         ; "BASE64" binary encoding format is defined in [RFC 2045]
                         / iana-token
         ; Some other IANA registered iCalendar encoding type
                         / x-name)
         ; A non-standard, experimental encoding type

    Description: The property parameter identifies the inline encoding
    used in a property value. The default encoding is "8BIT",
    corresponding to a property value consisting of text. The "BASE64"
    encoding type corresponds to a property value encoded using the
    "BASE64" encoding defined in [RFC 2045].

    If the value type parameter is ";VALUE=BINARY", then the inline
    encoding parameter MUST be specified with the value
    ";ENCODING=BASE64".

    Example:

      ATTACH;FMTYPE=IMAGE/JPEG;ENCODING=BASE64;VALUE=BINARY:MIICajC
       CAdOgAwIBAgICBEUwDQYJKoZIhvcNAQEEBQAwdzELMAkGA1UEBhMCVVMxLDA
       qBgNVBAoTI05ldHNjYXBlIENvbW11bmljYXRpb25zIENvcnBvcmF0aW9uMRw
       <...remainder of "BASE64" encoded binary data...>