Name first because it is what the object is called everywhere else — the OOXML cNvPr/@name,
the UI's selection pane — and because for a slicer or a shape it is the ONLY description
anything can offer. A chart is the exception and its name goes last: Chart 2 says nothing, and
what the chart plots is the one fact on the row that points back at cells.
The alt text joins it when set. It is prose a human wrote about a graphic a text report cannot show, so here it is not decoration: for a chart or a smart-art frame it is frequently the only sentence in the whole file that says what the graphic shows.
One movable as one line of prose:
Picture 1 — logo.png, or for a chartline · 8 series · values NOI!C4:J111 · categories NOI!B4:B111 · Chart 2.