[kepler-dev] [Bug 2050] - EMLDataSource output as Ptolemy records

[Dan Higgins]

Shawn,
    I am not sure that it is 'incorrect' to have one port per attribute, 
but I do see your point. I think you are just recommending the second 
option I suggested (the record/column array) ?  Options for either seem 
useful to me. The column based ports allow the selection of specific 
columns from a table when all the columns are not needed.

Shawn Bowers wrote:

>bugzilla-daemon at ecoinformatics.org wrote:
>  
>
>>http://bugzilla.ecoinformatics.org/show_bug.cgi?id=2050
>>
>>
>>
>>
>>
>>------- Additional Comments From sbowers at ucdavis.edu  2005-04-07 09:33 -------
>>I don't think it is correct to have one port per attribute.  This approach
>>looses the information that the ports are actually dependent.  This assumes a
>>particular domain functionality (i.e., that the director knows the dependency);
>>but the constraint cannot be captured in Ptolemy's constraint language.  
>>
>>>From a modeling perspective, it is more appropriate in Ptolemy to use a single
>>port that outputs a tuple (i.e., a record). Of course, one could always connect
>>an array deconstructor after the data set if desired. This approach (of
>>    
>>
>
>Sorry: I mean "record dissasembler" not array deconstructor :-)
>
>  
>
>>outputing tuples instead of individual values) follows more closely the standard
>>approach used in database systems and makes collection-oriented
>>dataflows/programming much easier.
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>>
>
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-- 
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Dan Higgins                                  higgins at nceas.ucsb.edu
http://www.nceas.ucsb.edu/    Ph: 805-893-5127
National Center for Ecological Analysis and Synthesis (NCEAS) 
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