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I want to filter from a dataset the polygons that contain no further polygons. I have tried the Transformer AreaOnAreaOverlayer and SpatialRelator (Attributes (s) that Must Differ = element_id) so far.

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I think the SpatialRelator (Spatial Predicates to Test: Requestor Contains Suppliers, Attribute(s) that Must Differ: element_id) might help you. The output feature having 0 in the _related_candidates attribute would be your required result.

Thank you takashi. Your tip helped a lot.

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