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[netcdf-java] Variable "values" within NcML Structure

Hi,
I'm trying to define the "values" in a "variable" that is within a "structure" type "variable". When I try to read them, I get: 

java.lang.NullPointerException
        at ucar.nc2.dataset.NetcdfDataset.readMemberData(NetcdfDataset.java:961)
        at ucar.nc2.Variable._readMemberData(Variable.java:931)
        at ucar.nc2.dataset.VariableDS._readMemberData(VariableDS.java:302)
        at ucar.nc2.Variable.readMemberOfStructureFlatten(Variable.java:659)
        at ucar.nc2.Variable.read(Variable.java:635)
It looks like it is trying to delegate the reading to "orgFile" which is apparently null. My NcML has no referenced dataset. I am using "explicit". The reading of values works fine in a top level variable. 

I'm using toolsUI-2.2.20.jar.

The key bits of my NcML look like:

    <variable name="time" type="double">
        <values start="0.0" increment="3600000.0"/>
    </variable>

    <variable name = "spectrum" type="structure">
        <variable name="frequency" type="double">
            <values start="0.0" increment="10.0"/>
        </variable>
        <variable name="value" type="double">
        </variable>
    </variable>


Thanks,
Doug
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