code: def get_all_attribute_value(
          self, tag_name, attribute, format_value=True, **attribute_filter
      ):
          
          tags = self.find_tags(tag_name, **attribute_filter)
          for tag in tags:
              value = tag.get(attribute) or tag.get(self._ns(attribute))
              if value is not None:
                  if format_value:
                      yield self._format_value(value)
                  else:
                      yield value
docs: Yields all the attribute values in xml files which match with the tag name and the specific attribute
  
          :param str tag_name: specify the tag name
          :param str attribute: specify the attribute
          :param bool format_value: specify if the value needs to be formatted with packagename