NCZarr reading a Zarr file with no variable name

[abhibaruah]

NetCDF version: 4.9.0
OS: Linux

I am using Zarr Python to create a Zarr file without a variable name.

My Python code:

import zarr
import numpy as np
z1 = zarr.open('example_zarr_py.zarr', mode='w', shape=(100,100), chunks=(10,10), dtype='i4')
z1[:] = 42
z1[0, :] = np.arange(100)
z1[:, 0] = np.arange(100)

The 'example_zarr_py.zarr' folder created has files like '.zarray', '0.0', '0.1'.... (the array data) and does not have a sub-folder with a variable or dataset name or a .zgroup file.

I am trying to read this file using NCZarr.

While I can open this file with:

status = nc_open(FILENAME, NC_NOWRITE, &ncid);
where FILENAME is "file://example_zarr_py.zarr#mode=zarr,file"

I am not sure of how to proceed after this to read the data as the logical next step in netCDF to read a variable is to use 'nc_inq_varid' with the variable name (For example in the example here) or 'nc_inq_var' to get the name of the first variable.

Are these Zarr files with no variable or dataset names and no '.zgroup' files not supported?
If not, how do I read the variable data?

example_zarr_py.zarr.zip

[DennisHeimbigner]

Does the Zarr V2 spec even allow this?

[abhibaruah]

The Python repro code that I posted above is borrowed from the Zarr documentation (https://zarr.readthedocs.io/en/stable/tutorial.html#creating-an-array) from the sections on 'Creating an Array' and 'Reading and writing data'.
I am not sure of what the Zarr v2 spec specifically mentions, but I thought that since this is the first example in the Zarr tutorials, it is allowed.

[DennisHeimbigner]

Unfortunately, there is a lot of stuff in the tutorial that is not in the
specification.
But I am curious, do you actually need a nameless array?

[abhibaruah]

We do not really need it as of now.
I was trying to experiment with NCZarr by creating files in Python and reading them using NCZarr. The nameless array was one of the first ones I created (by following the tutorial). So I tried to read the data using NCZarr.