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Vizlib Sankey Chart - Functionality to add a third dimension (e.g date) to see movement over time

Would be great to be able to add a DATE field as a third dimension on a sankey chart in order to see movement over time. Currently the chart only allows dimensions on one level (left to right), so from source to target, but cannot split this out by an additional dimension on top, e.g. a date field, to see movement over time using one chart. The only way to get the this view is by creating multiple sankey charts and placing them next to each other using SOURCE and TARGET as the two dimensions and then a different measurement for each graph to define the different DATE periods. 

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