Data Value DataValue Bases: Value[Unpack[Ts]] Abstract base class for data values. ShallowDataValue Bases: DataValue[str, Unpack[Ts]] Abstract base class for shallow data values. content() The content of shallow data value. get_content() Gets the content of shallow data value. Returns: str – String content. DeepDataValue Bases: DataValue[Unpack[Ts]] Abstract base class for deep data values.