When remapping feature definitions to an upgraded workspace the old workspace's feature definitions that are no long used remain in the DGN standards and available for use. This is a problem as the users made select them not know that the feat def is no longer used.

The CADD manage has to manual remove these unused feature definitions from every DGN using explorer. A tool that removes unused feature defections from the DGN standards is needed to automatic this task. Ideally the tool would also have a command line so it can be used in batch processing.

Alternately, this function can be added to DGN compression tool as an option.