Open/Import CityGML in AutoCAD

I have a CityGML file and want to open and further process it in AutoCAD. Any suggestions for a schmoove workflow?

For my specific use case, I only need the 2D coordinates of the file's <bldg:GroundSurface> elements' <gml:LinearRing><gml:posList>. That is, I'm only interested in the files' X and Y components. Maybe that makes it easier...