>>> import FeatureServer.DataSource
  >>> dir(FeatureServer.DataSource)
  ['DataSource', 'Lock', '__author__', '__builtins__', '__copyright__', '__doc__', '__file__', '__license__', '__name__', '__path__', '__version__', 'os', 'sys', 'time', 'warnings']
  
  >>> import FeatureServer.DataSource.DBM
  >>> dir(FeatureServer.DataSource.DBM)
  ['Action', 'DBM', 'DataSource', 'Lock', 'Recno', 'UserDict', '__author__', '__builtins__', '__copyright__', '__doc__', '__file__', '__license__', '__name__', '__version__', 'anydbm', 'pickle']

  >>> import FeatureServer.DataSource.WFS
  >>> dir(FeatureServer.DataSource.WFS)
  ['DataSource', 'Feature', 'OGR', 'WFS', '__author__', '__builtins__', '__copyright__', '__doc__', '__file__', '__license__', '__name__', '__version__', 'os', 'tempfile', 'urllib']

  >>> try:
  ...     import FeatureServer.DataSource.BerkeleyDB
  ... except ImportError:
  ...     pass