Hi Ken, Sorry to have abandoned this again. Your proposal is clearly workable in practice, but there are some issues with the implementation, of varying degrees of seriousness, that mean that it is not yet suitable for inclusion into CF. I agree that it seems like a minimally intrusive set of changes, but some of the aspects you propose are a bit like the tip of the iceberg in complexity, like the ancillary variables containing ancillary variables issue.
The issue there is that the `ancillary_variables` attribute is not currently standardised on ancillary variables, so the linkage doesn't formally exist. If you made it meaningful when viewing a variable as an ancillary variable then this would need further additions to the conventions text _and_ the CF data model would need extending in as-yet-unknown ways. Before that route is explored we have to be sure that there is no way of representing the information you require with the existing machinery. This could well be worse than it sounds! It is possible that minor changes could resolve these problems and make your proposal fit in with the CF view of data. I think that the key to progression might be to demonstrate clearly when any raised concerns are not in fact valid, or else be proactive in suggesting concrete alternative ideas, with examples, if none have been suggested. I think I can devote some time to thinking about this in detail again towards the end of August, when I am back from leave, so I look forward to carrying on the discussion then. All the best, David -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://urldefense.us/v3/__https://github.com/cf-convention/cf-conventions/issues/320*issuecomment-892831295__;Iw!!G2kpM7uM-TzIFchu!j7LEH4Tj2Lu-Qjnw4Swr6ADtlRtfgtbLXoj22G2XHQuOF8SkYcKWElbvPjF1BChzT0Q7740VIIk$ This list forwards relevant notifications from Github. It is distinct from [email protected], although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to [email protected].
