[trans] - Model comments

[CresitelloDittmar, Mark]

On Wed, Mar 11, 2020 at 10:55 AM David Berry <d.berry at eaobservatory.org>
wrote:

> For me the distinction between an Operation and a Mapping is a bit
> muddled as many operations are in fact bidirectional.
>

The alternate view (in the current model) is that *no* Operation is
bidirectional,  but some Operations may be trivially inverted to create an
inverse Operation.
  Y = X + 1 is unidirectional.. from X to Y; and can be trivially inverted
to X = Y - 1; for the inverse Operation from Y to X.

I'll workup the model in the way we've talked about here, and see how that
plays out in the example serializations for you.

I'm currently working through the Coords model examples, and will queue
that up next.

Mark
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