[CF-metadata] Overstated restriction on references to external variables in version 1.7

martin.juckes at stfc.ac.uk martin.juckes at stfc.ac.uk
Wed Apr 5 02:36:47 MDT 2017

Hello All,

Section 2.6.3, External Variables, of version 1.7 of the standard contains the statement that:"The only CF standard attribute which is allowed to refer to external variables is cell_measures."

I believe this is stronger than intended: it should be possible, for instance, to refer to external variables in the comment and history attributes, and any other free text attribute, or the comment part of the cell_methods string. 

Should it say something along the lines of:
"The only attribute which is allowed to make a CF standard reference to external variables is cell_measures"?


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