G'Day folks Maybe people would be willing to give me their impressions on some ideas. There are two key ideas I have been playing with namely Domains and Structures. By a Domain I mean some kind of tagging in netCDF to indicate that the data is applicable to a particular domain (eg CAD. Vision, Time-series, etc..). My routines for analysing time-series are not able to take advantage of data in a form suitable for CAD/CAM, or images or etc.. If there was such a tag, applications could automatically decide whether the data in a netCDF file is relevant to them. This would allow a more object oriented approach and save on development time for applications. The other idea was to have C-like structures within a netCDF file where each leaf could be tagged separately and the data can remain grouped. It can be an addition to netCDF as opposed to a replacement of current status. If anyone has somehow implemented structures I would sure be interested in hearing about it. best regards Ata <(|)>.