[CF-metadata] Re: projections in CF

[Jonathan Gregory]

Dear Bob

> ... we could write code to parse a (combined) projection attribute, but this
> isn't necessarily easy to do such that the code is portable, maintainable,
> extensible, and usable for all languages and APIs!

Yes, that's true. But we have to do this for several of the other CF attributes
anyway! So we can use whatever technology we develop for it.

I guess it turns partly on whether we have a per-variable definition or a per-
file one.

Best wishes

Jonathan