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Following on to my question re changing layers - I looked for a means to list the layers used in a given cell and could not find anything likely-looking. I'm after a way to check that cells (bottom to top) have been cleaned of "datatype 0" features. I do not want a lengthy list of polygons (although I could probably deal, if I was able to export and grep / vi) so much as a compact used-layers report @ present level, or a report with per-cell used-layers.
Obviously the layout "open" knows the totality of used layers because it builds the layer list before allowing layer properties to be loaded. But I'm after a finer-grained listing that suits the task at hand (moving invalid to valid layer/datatype, polygon by polygon, down in the lower levels of hierarchy, and wanting some "present-context assessment of done-ness").