I have created a workspace with the help of Mr. Takashi(a person from this forum) that reads the shapefile ,creates buildings then these buildings are separated in storeys and then the storeys are separated in roof,ground and wall surfaces. All this work is attached.I want to find a way to write this information in CityGML (Lod 2).In conclusion i want a workspace that gives me a CityGML writer with the buildings.