ReadonlyidUnique in the file; see OfficeChart.id.
ReadonlypositionIts slide's number, or its number in the document, from 1.
ReadonlynameThe frame's name, such as Chart 3.
Optional ReadonlytitleThe title the chart shows, when it shows one.
Optional ReadonlydescriptionThe alternative text the author gave it.
ReadonlylabelWhat the picker says.
One chart the picker offers.