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Java netCDF 2.2.14 Structures API Example Code?

Has anyone used the Java NetCDF library to define and write structures (e.g., point observation data)? Is there a tutorial or cookbook example documented anywhere?

I naively tried the following (code snippet):
        Structure struct = new Structure(ncFile, null, null, "obs");
        ncFile.addVariable("obs", DataType.STRUCTURE, new Dimension[] {iDim});

	// more stuff happens

        ncFile.create();
But received the following disconcerting run-time error:
Exception in thread "main" java.lang.IllegalStateException: unknown DataType == Structure
        at ucar.nc2.N3header.getType(N3header.java:434)
        at ucar.nc2.N3header.writeVars(N3header.java:627)
        at ucar.nc2.N3header.create(N3header.java:487)
        at ucar.nc2.N3iosp.create(N3iosp.java:299)
        at ucar.nc2.NetcdfFileWriteable.create(NetcdfFileWriteable.java:320)
So I'm not at all clear whether structures are fully implemented in version 2.2.14 or what the proper sequence of netCDF API calls are that I need to be making. Can anyone offer me guidance?

Thanks in advance! Cheers -- Mark