I would appreciate community views on the interpretation of global attributes 
from a NetCDF file.

Scenario:
  - My file has multiple data variables and a list of global attributes.
  - I am loading one data variable and the associated information from one file.

Question:
  - The global attributes apply to the file. In general, do they apply to each 
data variable within the file?

To properly describe my data variable should I fetch the globals and assign 
them to my 'in memory' representation of my data variable?

The global attributes 'history', 'conventions' and 'title' are described by CF 
differently to other globals: applying to the file but not valid data variable 
attributes;
  - Should my loaded data variable be aware of these attributes?  

thank you
mark
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