DataPoint Element (RDL)
Defines a single data point for a chart.
There must be one DataPoint element for each static category in a chart series. If the chart series does not contain static categories, the DataPoints element must contain one and only one DataPoint element. The data values within the child DataValues element can be a single value expression (in the case of bar or line charts) or multiple value expressions (in the case of stock and bubble charts).