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I guess this would be your starting point:

wiki.openstreetmap.org/…/Simple_Indoor_Tagging

wiki.openstreetmap.org/wiki/Tag:shop%3Dmall

Ideally you take a picture of an emergency evacuation plan, use a scanner app to remove the distortion, and then put it as background in JOSM to trace the layout

@Zwiebel @openstreetmap

Don't copy from maps you don't have permission to use.

https://wiki.openstreetmap.org/wiki/Copyright#Proprietary_data

I don’t think they are copyrighted? They are made according to ISO23601