code: public int deleteCascade(Collection<Metadata> metadataCollection)
  			throws SQLException {
  		int count = 0;
  		if (metadataCollection != null) {
  			for (Metadata metadata : metadataCollection) {
  				count += deleteCascade(metadata);
  			}
  		}
  		return count;
  	}
docs: Delete the collection of Metadata, cascading
  
  @param metadataCollection
  metadata collection
  @return deleted count
  @throws SQLException
  upon failure