My FME translation includes 2 different streams depending on the type of data provided in a zipped file GDB. So the first step before processing data is to test whether it contains a rater dataset/mosaic dataset or any number of feature classes.

I don't want to read data yet, just check the data type of feature datasets.

What's the best way to check that? Tried a generic schema reader but it doesn't provide an attribute with the format of feature types inside the file GDB.