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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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>From: Steve Emmerson <steve@xxxxxxxxxxxxxxxx> >Organization: UCAR/Unidata >Keywords: 200007171838.e6HIcxT08419 Steve- >> I think this objective remains valid, and perhaps "pluggable semantic >> parsers" could help us get there, though I don't yet understand >> exactly what it means. I once proposed that Steve's netCDF adapter >> for VisAD could be augmented with a constructor whose signature >> included a text string making the MathType explicit, i.e., replacing >> Steve's intelligent guesswork with knowledge of specific netCDF files >> or conventions. Is the pluggable semantic parser idea more or less >> equivalent? > >I wouldn't do it that way. Instead, I'd have a programatically-settable >layer above the import layer whose job would be to convert the incoming >data object(s) into something that is known a priori to be more >appropriate for the task at hand. This would separate the semantics of >the data from the nut-and-bolts of reading it in. You wouldn't want to read in the entire netCDF file and then pick the Data object apart, if you already knew the netCDF variables and knew the MathType you wanted to return. That would be unnecessary overhead. One thing that would be very useful would be to enhance visad.data.netcdf.Plain so it can return the just MathType of the netCDF file. Add that to the capability of specifying the MathType of the data you want to get at as Dave (and others) have requested, and one could create a netCDF browser GUI that would allow the user to create new MathTypes and retrieve just data associated with those. Don ************************************************************* Don Murray UCAR Unidata Program dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000 (303) 497-8628 Boulder, CO 80307 ************************************************************* Unidata WWW Server http://www.unidata.ucar.edu/ McIDAS Demonstration Machine http://mcdemo.unidata.ucar.edu/ *************************************************************
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