I can view CityGML File in FZKViewer but is there any tool available that allow me to edit cityGML file?
I can easily open cityGML in notepad or notepad++ but its code/tag syntax is not highlighting therefore it is difficult to edit.
Try to use Notepad++ for XML syntax highlighting to highlight GML. You can do it from
Language -> XML. GML is an XML grammar to express geographical features.
The Geography Markup Language (GML) is the XML grammar defined by the Open Geospatial Consortium (OGC) to express geographical features.
For more information, you can read about it from above line.