netcdf-c/nczarr_test/ref_xarray.cdl

netcdf tmp_xarray {
dimensions:
	x = 2 ;
	y = 5 ;
variables:
	int i(x, y) ;
data:

 i =
  _, _, _, _, _,
  _, _, _, _, _ ;
}
Add support for the XArray Zarr _ARRAY_DIMENSIONS attribute The XArray implementation that uses Zarr for storage provides a mechanism to simulate named dimensions. It does this by adding a per-variable attribute called _ARRAY_DIMENSIONS. This attribute contains a list of names to be matched against the shape values of the variable. In effect a named dimension is created with the name _ARRAY_DIMENSIONS(i) and length shape(i) for all i in range 0..rank(variable). Both read and write support is provided. This XArray support is only invoked if the mode value of "xarray" is defined. So for example, as in this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,xarray,s3 ```` Note that the "xarray" mode flag also implies mode flag "zarr", so the above is equivalent to this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,zarr,xarray,s3 ```` The primary change to implement this was to unify the handling of dimension references in libnczarr/zsync. A test for this and other pure-zarr features was added as nczarr_test/run_purezarr.sh Other changes: * Make sure distcheck leaves no files around. * Change the special attribute flag DIMSCALEFLAG to HIDDENATTRFLAG to support the xarray attribute. * Annotate the zmap implementations with feature flags such as WRITEONCE (for zip files). 2021-02-25 04:46:11 +08:00			`netcdf tmp_xarray {`
			`dimensions:`
			`x = 2 ;`
			`y = 5 ;`
			`variables:`
			`int i(x, y) ;`
			`data:`

			`i =`
			`_, _, _, _, _,`
			`_, _, _, _, _ ;`
			`}`