Sequences, hyperslabs and selections

[Roy Mendelssohn]

I am very curious what answer this will receive.  Right now, for any 
OPeNDAP server we have that returns sequences, such as the java 
Database server, if I try to give a hyperslab I get an error.  Also, 
if I have a grid type, and I try to give it a constraint expression, 
I get an error.

Does the DAP 2 specifications not allow the actions above, or are 
these capabilities theoretically in the specifications and not 
implemented in the servers?

-Roy

At 6:05 PM -0300 5/29/06, Roberto De Almeida wrote:
>Hi, all. A quick question:
>
>If a client applies both a hyperslab and a selection on a sequence,
>what is the order of precedence? Eg, if I have the following dataset:
>
>  Dataset {
>    Sequence {
>      Float64 lat;
>      Float46 lon;
>    } coastline;
>  } coastline.db;
>
>And a client requests the following URL:
>
>  http://example.com/coastline.db.dods?coastline[0:1:9]&coastline.lat>80
>
>Am I right to assume that the hyperslab should be applied *after*
>(return the first 10 items were latitude is greater than 80) the
>selection? This is not clear on the DAP 2 draft.
>
>Thanks,
>Roberto


-- 
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"The contents of this message do not reflect any position of the U.S. 
Government or NOAA."
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Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn at noaa.gov (Note new e-mail address)
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"Old age and treachery will overcome youth and skill."