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Hello
FME community!

Please lend me a hand in solving this.
I've tried to explain (in pictures) best I can what I want to achieve. Have not
been able to find any information or example of how to write CityGML files like
this in FME.

These pictures describe 1 building.
First picture is the surface_geometry table (I know, building geometry should
reference their geometry using xlink_href but haven't gotten that far yet) This
data is read from a CityGML database. The second picture describes how the
CityGML files looks when exported from the database exporter. I want to build
the same CityGML file within FME and later use FME to upload CityGML into the
database.

If I aggregate the geometry before I
write, I loose the UUID and thehierarchy. If I don't, what should be 1
building is 22 buildings. Both the root and the composite doesn't have any
geometry. Any help would be greatly appreciated, I've been struggling with this
thing for some time.

Can you post a screenshot of the Aggregator parameters? I'm guessing you'll want to have Mode = Assemble Hierarchy at the very least. Probably also convert attributes to traits (traits are like attributes but I think can be connected to individual parts of a multiple geometry, in a way attributes can't).

Thank you @mark2catsafe for your help, much appreciated! :)

I managed to get the hierarchy structure going by tweeking the aggregator parameters like you suggested. But it's still quite different from the screenshot I showed above. I have played around with the traits but can't figure out how to define a "CompositeSurface" (picture above id(20)) instead of "Building" (picture below). Because of that 1 building has turned in to 23. I have attached the workspace if it makes things easier.citygml-geometryhierarchy.fmwt

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