A new function was defined, XdataInterpreter::getChartTypeSpecificData. Being 100% chart-type-agnostic when retrieving chart data is impossible; candlestick charts can have different numbers of sequences per series, and this information is not present in any other chart type. Change-Id: I0f54b09202c42667331b083d54d90e4ceee81083 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113075 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>