If the data stored consists only of floating point numbers (double
values), the returned instances should also support the service
::NumericalDataSequence .
If the data stored consists only of strings, the returned
instances should also support the service
::TextualDataSequence .
a sequence of objects that support at least the
service DataSequence .
If the data stored consist only of floating point numbers
(double values), the returned instances should also support
the service ::NumericalDataSequence .
If the data stored consist only of strings, the returned
instances should also support the service
::TextualDataSequence .