[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 04:56:40 MDT 2017


Hi David,

my point is indeed that you should be able to put anything in them, so have a standards document which says that you can't put references to external variables in them would be a mistake .....

cheers,
Martin

________________________________
From: David Hassell [david.hassell at ncas.ac.uk]
Sent: 05 April 2017 11:35
To: Juckes, Martin (STFC,RAL,RALSP)
Cc: CF Metadata
Subject: Re: [CF-metadata] Overstated restriction on references to external variables in version 1.7

Hello Martin,

I don't quite see what you mean - such attributes are non-standardised, so you can already put anything you like in them, but software won't be able to do anything about it. Could you perhaps give a CDL example?

Many thanks,

David

On 5 April 2017 at 09:36, <martin.juckes at stfc.ac.uk<mailto:martin.juckes at stfc.ac.uk>> wrote:
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"?

regards,
Martin

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David Hassell
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