code: public boolean isEmpty() {
  		return _name == null &&
  			_description == null &&
  			(_author == null || _author.isEmpty()) &&
  			_copyright == null &&
  			_links.isEmpty() &&
  			_time == null &&
  			_keywords == null &&
  			_bounds == null;
  	}
docs: Return {@code true} if all metadata properties are {@code null} or empty.
  
  @return {@code true} if all metadata properties are {@code null} or empty