How can I convert from the IMDF standard to the IndoorGML standard.

I would imagine you would need to use FME Workbench for this and transform the IMDF dataset so that it can be written out in the IndoorGML format. I couldn't find an IMDF to IndoorGML examples, however here are some resources and examples that involve reading from IMDF or writing to IndoorGML to hopefully give you some ideas.

• The FME Hub has some sample workspaces that transforming IMDF to other formats
• CityGML to IndoorGML example
• Webinar: From Outdoor to Indoor: 3D and Venue Mapping

Feel free to post more questions if you come across any specific challenges with your workflow.