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[netcdfgroup] how to tell if a hdf5 is netcdf

Hi,
How to tell if a given hdf5 file is netcdf 4 other than the file extension? I opened a netcdf4 file in HDFView looking for metadata which tells that the file is netcdf 4. I couldn't locate one.

Related problem, would it be possible to create a netcdf 4 using HDFView? Any help is appreciated.

Upendra