Also see:
A Variable Attribute indicating what chunking to use to store the data in a file. Used when writing netCDF-4 files. When an HDF5/ netCDF-4 is read, this attribute is added to the variable's metadata.
A Variable Attribute indicating if compression should be used when writing the variable. Used when writing netCDF-4 files and for ncstream. Currently the only valid value of the attribute is "deflate", indicating to use the deflate compression algorithm.
The existence of this Variable Attribute means that a Variable's data is unsigned. Only used only for byte, short, and int data types. The value of the attribute is ignored, but by convention, should be set to true.