b8raoult

Created a pull request

@vidurmithal this is a good idea. The most important is that CliMetLab is seen as a framework with a plug-in architecture. So yes, support for different plotting software is a...

Yes, that is correct. One of the challenge is to route a call to `cml.plot_map(some_dataset, some_options)` to the right plotting backend and generate a reasonable plot based on the type...

Thanks for the info. It is indeed an artificial example which we use to test indexing in [anemoi-datasets](https://github.com/ecmwf/anemoi-datasets). Anemoi's indexing virtually combine several Zarr (join, subset, etc.) and will internally...

Our use case is to allow researchers to combine data from several datasets for training: - [Sub-setting (in time)](https://anemoi.readthedocs.io/projects/datasets/en/latest/datasets/using/subsetting.html). - [Combining (in time, variables, ensemble and grids)](https://anemoi.readthedocs.io/projects/datasets/en/latest/datasets/using/combining.html). - [Selecting variables](https://anemoi.readthedocs.io/projects/datasets/en/latest/datasets/using/selecting.html)....

We use Zarr directly. Also our datasets are not organised according to the CF conventions. We want all variables for one date in the same chunk, not one array per...

I understand that. I just wanted to report it. I'll exclude the empty string in my code.

Please note that zarr 2.18.7 does not return that empty string.

But, zarr2 did return `.zgroup`. I expect `keys()` to return all arrays and sub-groups.