code: @Override
  	protected void validateContents(Contents contents) {
  		// Verify the Contents have a features data type
  		ContentsDataType dataType = contents.getDataType();
  		if (dataType == null || dataType != ContentsDataType.FEATURES) {
  			throw new GeoPackageException("The "
  					+ Contents.class.getSimpleName() + " of a "
  					+ FeatureTable.class.getSimpleName()
  					+ " must have a data type of "
  					+ ContentsDataType.FEATURES.getName());
  		}
  	}
docs: {@inheritDoc}