The AutoCAD DWF reader extracts entities, one at a time, from the entity section of the drawing file and passes them on to the rest of the FME for processing. Complex entities such as polylines and inserts are exploded and broken into several individual FME features. If the entity has attribution stored as extended entity data, then these attributes are ignored.
When the AutoCAD reader encounters an entity type it does not know how to process, it simply sets the entity type of the feature and returns it. This feature is then logged by the FME correlation subsystem and the reader moves on to the next entity.