parameters: (
      message_or_descriptor: MessageOrDescriptorBase)
return_statement: return get_value_for_annotation_extension(message_or_descriptor,
                                              annotations_pb2.fhir_fixed_system)
docstring: Returns the value associated with the fhir_fixed_system annotation.
  
    Args:
      message_or_descriptor: A protobuf Message or DescriptorBase to examine.
  
    Returns:
      The string value associated with the fhir_fixed_system annotation, if one
      exists. Otherwise, returns None.
  
    Raises:
      ValueError: Unable to retrieve options for type: <type>.
docstring_summary: Returns the value associated with the fhir_fixed_system annotation.
docstring_tokens: Returns the value associated with the fhir_fixed_system annotation .
function: def get_fixed_coding_system(
      message_or_descriptor: MessageOrDescriptorBase) -> Optional[str]:
    """Returns the value associated with the fhir_fixed_system annotation.
  
    Args:
      message_or_descriptor: A protobuf Message or DescriptorBase to examine.
  
    Returns:
      The string value associated with the fhir_fixed_system annotation, if one
      exists. Otherwise, returns None.
  
    Raises:
      ValueError: Unable to retrieve options for type: <type>.
    """
    return get_value_for_annotation_extension(message_or_descriptor,
                                              annotations_pb2.fhir_fixed_system)
function_tokens: def get_fixed_coding_system ( message_or_descriptor : MessageOrDescriptorBase ) -> Optional [ str ] : return get_value_for_annotation_extension ( message_or_descriptor , annotations_pb2 . fhir_fixed_system )