[tz] What are the interfaces to the TZDB?

Hi, On 08.11.21 09:27, Clive D.W. Feather via tz wrote:

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What I am sensing from your proposal, as well as from some of the followup comments, is a need to further clarify exactly what the tzdb project's interfaces are. I agree with this. I think it should have priority over the rest of this discussion.

Which are we talking about?  There are already the POSIX interfaces.   Are we talking about the binary files?  Is this something on which we are likely to gain consensus? Eliot