Hi Stephen, I also advocate keeping support for groups simple. The simplest support imaginable is that groups should be completely self-contained without attribute inheritance. This would go in the right direction, yet I think attribute inheritance, at least of global metadata, ought to be strongly considered. Otherwise useful attributes like "history" and "Convention" have to be stored in each group....
cz Le 17/09/2013 04:56, [email protected] a écrit : > Bryan has beaten me to the points I would have made. I think hierarchies are > over rated at the interface level. Examples abound of where they have been > abandoned: hierarchal vs relational DBs, XML databases and tools (save us > from xquery for Netcdf!). > > Under the hood hierarchies are often necessary for scalability and we all use > them as a crutch when no better tools exist. > > I would advocate keeping support for groups very simple. CF could treat any > netcdf file containing groups as if it was a directory of netcdf files with > attached metadata. IMO complex rules about inter-group relationships should > be avoided. I guess attribute inheritance must be an exception here but I > would urge caution. One of the CF data model tickets has got a detailed > debate on interpretation of the current standard regarding variable > attributes overriding global attributes. Lessons from that should be learned. > > Stephen. > > -- > Stephen Pascoe from iPhone > -- Charlie Zender, Earth System Sci. & Computer Sci. University of California, Irvine 949-891-2429 )'( _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
