code: def _ParseRelationshipsXMLFile(self, xml_data):
      
      xml_root = ElementTree.fromstring(xml_data)
  
      property_files = []
      for xml_element in xml_root.iter():
        type_attribute = xml_element.get('Type')
        if 'properties' in repr(type_attribute):
          target_attribute = xml_element.get('Target')
          property_files.append(target_attribute)
  
      return property_files
docs: Parses the relationships XML file (_rels/.rels).
  
      Args:
        xml_data (bytes): data of a _rels/.rels XML file.
  
      Returns:
        list[str]: property file paths. The path is relative to the root of
            the ZIP file.
  
      Raises:
        zipfile.BadZipfile: if the relationship XML file cannot be read.