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IDV and NcML aggregation

IDV gang,
I tried using IDV with NcML for the first time, trying to aggregate two data sets along the time dimension (which is the actually called "ocean_time" in the netcdf file) 

The data source comes up, but no Fields are displayed.

Here's my NcML:

http://stellwagen.er.usgs.gov/rps/share/test_agg.ncml

<?xml version="1.0" encoding="UTF-8"?>
<netcdf xmlns="http://www.ucar.edu/schemas/netcdf"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="http://www.ucar.edu/schemas/netcdf http://www.unidata.ucar.edu/schemas/netcdfDataset2.xsd";> 
<netcdf>
<aggregation dimName="ocean_time" type="joinExisting"/>
<netcdf uri="http://stellwagen.er.usgs.gov/adria/models/roms_sed/sed031/adria03_sed031_his_0014.nc"/> <netcdf uri="http://stellwagen.er.usgs.gov/adria/models/roms_sed/sed031/adria03_sed031_his_0015.nc"/> 
</netcdf>
</netcdf>


My question:
Is this an IDV problem or a problem with how I formulated the NcML?
And could I have figured this out myself? (Is there a way to validate NcML?) 

Thanks,
--
Richard P. Signell
U.S. Geological Survey       Phone: (508) 457-2229
384 Woods Hole Road          Fax:   (508) 457-2310
Woods Hole, MA  02543-1598
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