Hi i have attached 2 ways i carried out my transformation from esri shapefile to citygml. The first way is shown below in the attachment. However, I am not able to upload the final citygml file into an online portal as it says there is an error with the file. I am not sure where i went wrong in my transformation. Can someone please help? Thanks.
For the second way, i just used attribute creator and geometry setter after i extruded and then used the citygml writer to write the file. The forum that explains this is as follows.