Created: [Apr 6, 2004]

Defines a TZID iCalendar component property.

    4.8.3.1 Time Zone Identifier

       Property Name: TZID

       Purpose: This property specifies the text value that uniquely
       identifies the "VTIMEZONE" calendar component.

       Value Type: TEXT

       Property Parameters: Non-standard property parameters can be
       specified on this property.

       Conformance: This property MUST be specified in a "VTIMEZONE"
       calendar component.

       Description: This is the label by which a time zone calendar
       component is referenced by any iCalendar properties whose data type
       is either DATE-TIME or TIME and not intended to specify a UTC or a
       "floating" time. The presence of the SOLIDUS character (US-ASCII
       decimal 47) as a prefix, indicates that this TZID represents an
       unique ID in a globally defined time zone registry (when such
       registry is defined).

            Note: This document does not define a naming convention for time
            zone identifiers. Implementers may want to use the naming
            conventions defined in existing time zone specifications such as
            the public-domain Olson database [TZ]. The specification of
            globally unique time zone identifiers is not addressed by this
            document and is left for future study.

       Format Definition: This property is defined by the following
       notation:

         tzid       = "TZID" tzidpropparam ":" [tzidprefix] text CRLF

         tzidpropparam      = *(";" xparam)

         ;tzidprefix        = "/"
         ; Defined previously. Just listed here for reader convenience.

       Example: The following are examples of non-globally unique time zone
       identifiers:

         TZID:US-Eastern

         TZID:California-Los_Angeles

       The following is an example of a fictitious globally unique time zone
       identifier:

         TZID:/US-New_York-New_York