All,

MMI will soon make a recommendation to some netCDF users, and perhaps to the 
community, about storing  their parameter name associations within a CF netCDF 
file.  And so we'd like advice.

In particular, we face a scenario where the user has a set of local parameter 
names, which may be mapped to, or even equivalent to, terms in multiple 
community vocabularies.  Here are 3 use cases, simplest first:

1. A term is not found in the CF standard names list, and for whatever reason 
can not be in that list.
2. Local custom requires association with a different vocabulary than CF.
3. There are multiple applicable vocabularies, which together fully describe 
this parameter, but individually are not sufficient.

In each case each individual name may be associated with a single external 
vocabulary, but some names have different associated vocabularies than others.  
In the third case (and perhaps the second), a single name may be associated 
with multiple external vocabularies.

It should be assumed that the association can be made by reference to a URI; 
that is, it is not necessary to specify both a vocabulary AND a term within 
that vocabulary, the URI can encompass both.  (As opposed to a solution which 
requires a namespace for each vocabulary, then the term is specified within 
that namespace -- this has a certain appeal but isn't as important as 
compatibility with URIs. 

Is there any particular operational practice or recommendation as to best 
practice, to enable associating the local parameter with terms in multiple 
community vocabularies, not just CF vocabularies?  If not, does anyone want to 
recommend one to me?  (I am willing to recommend it to CF if it makes sense to 
me, but I'm not skilled enough to try to originate a really good approach all 
by myself.)

I have reviewed the trac tickets but do not believe that any of them directly 
address this concern.  Thank you for any advice.

John
-- 
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John Graybeal   <mailto:[EMAIL PROTECTED]>  -- 831-775-1956 
Monterey Bay Aquarium Research Institute
Marine Metadata Interoperability Project: http://marinemetadata.org   
Shore Side Data System: http://www.mbari.org/ssds
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