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[netcdf-java] Understanding FeatureDatasetFactoryManager.findFeatureType(ncd)

Hi All,

I'm trying to better understand how to use FeatureDatasetFactoryManager. Currently in NetCDF 4.2 when using FeatureDatasetFactoryManager.findFeatureType(ncd) I'm getting a null returned from my test dataset which is a grid. How is the featureType determined by, reading some internal data structure, or does cdm_data_type attribute need to popopulated, or ?

Thanks, Dave