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Hi Bob, Interesting, I've been interested in indexing in HDF5 for a while now, but I wouldn't necessarily have thought it would be needed for the NC4 work. Are you thinking about the "get the n'th object" calls in netCDF? Quincey > As a result of some discussion, I have a revised list of major goals > for NCSA. > > In the web page: > > http://my.unidata.ucar.edu/content/software/netcdf/netcdf-4/index.html > there is one item under 'New Features for HDF5', 'Explicit support for > coordinate variables/axes'. Item 2 below is a refinement of that > bullet. > > The other 3 can be added. > > Consider these bullets a proposal, subject to discussion. When we get > consensus on these, we'll set some firm milestones. > > 1. Update and correct the HDF5 specification document. > > 2. A dimension scales API sufficient to support coordinate > variables/axes. > See the proposal > <http://hdf.ncsa.uiuc.edu/apps/netcdfh5/h5shared_dims.html> > for an initial idea. We need to review and gain consensus on > the design, and then implement it. > > 3. An index object that permits specifying an order for iterating > over > a set of objects, and perhaps also permits efficient insertion into > and deletion from the ordered set it indexes. > > 4. MPI-IO enhancements to improve performance, as suggested by the > Northwestern/Argonne work. > > -- > Robert E. McGrath (HDF Java Team Leader) > National Center for Supercomputing Applications > University of Illinois, Urbana-Champaign > Champaign, Illinois 61820 > (217)-333-6549 > > mcgrath@xxxxxxxxxxxxx >