RFC 2445 Q: is TZID broken?

[Mark Swanson <mark@xxxxxxxxxxxxxxxxxxxxxxx>]

Hello,

There seems to be an issue with time zones:
(from the spec)

	"The specification of
        globally unique time zone identifiers is not addressed by this
        document and is left for future study."

Since I'm seeing various popular ICalendar implementations use their own 
formats, how can anything be expected to interoperate?

You obviously can not rely on GMT offset ("America/Phoenix" and 
"America/Denver" both have GMT-07:00, but differ in daylight savings 
behavior) so time zone identifiers are required.

Would a list of timezones for every available implementation be required? As 
well as a mapping between them all?

Anyone can see the time zones that ScheduleWorld uses by iterating through the 
available TimeZone.getAvailableIDs(). 

Thank you.

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