[Esip-documentation] some open questions re ACDD & THREDDS

[John Graybeal via Esip-documentation]

A question was posed on the Active Issues page that I haven't seen an answer to: 

What is THREDDS 'variable mapping'? 

In the variable attributes, we say things like 
> If a "standard_name" attribute is not given (and a "standard_name_vocabulary" is given), the "long_name" attribute value will be used by THREDDS as the variable's name in the variable mapping. 

I don't know what this last part means exactly -- can someone help?

Derrick Snowden wrote some time ago that he'd like to see the reference to external applications minimized or eliminated in ACDD. Aside from cdm_data_type, which is explicitly tied to THREDDS, the 3 variable attributes have this kind of 'what THREDDS does' reference. Do we need it?

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