series
The series Discrete dimension is used to "split" your data into multiple series allowing to display them differently.
By default there is only 1 series, and all data is part of this series. When specifying a series Dimension, the data will be split into several List, each series will be available through Dataset.dataBySeries and Mark compatible with multiple series will handle them accordingly.
For example, when defining multiple series a LineMark will draw a line for each series. Having multiple series will allow stacking of compatible Mark like ColumnMark...