@classmethod
def decode(cls, stream):
    """Decodes presentation data value item from data stream

        Presentation data value is left in raw string format.
        The Application Entity is responsible for dealing with it.

        :param stream: raw data stream
        :return: decoded presentation data value item
        """
    item_length, context_id = cls.header.unpack(stream.read(5))
    data_value = stream.read(int(item_length) - 1)
    return cls(context_id, data_value)
