def METHOD_NAME() -> DeepDict:
    """
    Return structure with defaulted metadata values required for a NWBFile.
    These standard defaults are
        metadata["NWBFile"]["session_description"] = "no description"
        metadata["NWBFile"]["identifier"] = str(uuid.uuid4())
    Proper conversions should override these fields prior to calling NWBConverter.run_conversion()
    """
    metadata = DeepDict()
    metadata["NWBFile"].deep_update(
        session_description="no description",
        identifier=str(uuid.uuid4()),
    )
    return metadata