The VisualAge Smalltalk ObjectExtender Guide describes the ObjectExtender feature: a powerful and extensive persistence framework. ObjectExtender enables your object models to persist in relational data stores as well as provides linkages to legacy data on CICS and IMS systems. Creating the persistence layer is accomplished using the ObjectExtender tool set. The tool set helps you describe the business objects in your model that will persist in a data store. The tools generate the supporting code that services your persistent business objects.