code: def parse_from_string(
          root_processor,  # type: RootProcessor
          xml_string  # type: Text
  ):
      # type: (...) -> Any
      
      if not _is_valid_root_processor(root_processor):
          raise InvalidRootProcessor('Invalid root processor')
  
      parseable_xml_string = xml_string  # type: Union[Text, bytes]
      if _PY2 and isinstance(xml_string, Text):
          parseable_xml_string = xml_string.encode('utf-8')
  
      root = ET.fromstring(parseable_xml_string)
      _xml_namespace_strip(root)
  
      state = _ProcessorState()
      state.push_location(root_processor.element_path)
      return root_processor.parse_at_root(root, state)
docs: Parse the XML string using the processor starting from the root of the document.
  
      :param xml_string: XML string to parse.
  
      See also :func:`declxml.parse_from_file`