code: def get_element_by_path(tree, path_and_name, namespace):
      # type: (_Element, str, str) -> typing.Union[_Element, None]
      
      global xml_element_cache
      namespace_map = {'A': namespace[1:-1]}
      base_path, element_name = path_and_name.rsplit('/', 1)
      if base_path in xml_element_cache:
          base_element = xml_element_cache[base_path]
      else:
          base_xpath = ar_path_to_x_path(base_path)
          elems = tree.xpath(base_xpath, namespaces=namespace_map)
          base_element = elems[0] if elems else None
          xml_element_cache[base_path] = base_element
  
      element_found = None
      if base_element is not None:
          element_found = base_element.xpath(
              ".//A:SHORT-NAME[text()='{name}']/..".format(name=element_name),
              namespaces=namespace_map)[0]
      return element_found
docs: Find sub-element of given path with given short name.