A DataSetMessage field is the representation of a DataSet field in a DataSetMessage.
A DataSet field contains the actual value as well as additional information about the value like status and timestamp.
A DataSet field can be represented as a DataValue, as a Variant or as a RawData in the DataSetMessage field. The representation depends on the DataSetFieldContentMask defined in 188.8.131.52.
The representation as a DataValue is used if value, status and timestamp should be included in the DataSetMessage.
The representation as Variant is used if value or bad status should be included in the DataSetMessage.
The representation as RawData is the most efficient format and is used if a common status and timestamp per DataSet is sufficient.