Comment 4 for bug 502075

> Same thing happens to PDF and AI, so I don't think it
> needs an extra bug report.

I don't quite agree ;) Importing SVG IMHO is a special case, because the layer structure in the imported Inkscape SVG file exists and seems obscured by the UI for layers (layers <-> groups).

Missing support of internal layer structure of PDF and AI files (Do PDF files really have a layer structure?) is IMHO a different issue and depends on an import filter capable of interpreting the content of the PDF as Inkscape layers or even reverse-engineering the AI proprietary format.