ReadonlyslideThe chart's slide, by the file's slide id (p:sldId/@id).
ReadonlyshapeThe chart's frame, by its shape id on that slide (p:cNvPr/@id).
ReadonlynameThe frame's name, such as Chart 3, by which the chart is found on its slide when its shape id has changed.
The chart an add-in reads, as its settings keep it in the presentation.