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Lynton- I have just checked in a partial fix for your problem. There were 3 different kinds of problems. 1. ncgen was improperly handling datalists with vlens. This is the primary fix. 2. the version of your example that I had had a couple of errors in it, namely, the data for compound type fields must be enclosed in {...} when the field is non-scalar. 3. Even after fixing 1 and 2, your example causes HDF5 library failures. I will be working on that separately. I inserted your example (with #2 fixed and with the causes of #3 commented out) in netcdf/ncdump/cdl4/ref_tst_vlen_data2.cdl and it is now part of the test set. I am not closing this issue just yet until you have had a chance to test it. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: JNH-860762 Department: Support netCDF Priority: Critical Status: Closed