The OPM tools support construction of a multidatabase system consisting of databases that have been developed using OPM (such as GDB 6.0) or that have been retrofitted with an OPM view (such as GSDB 2.0). Currently the OPM retrofitting tool can be applied only to relational databases. We are, however, in the process of extending the OPM retrofitting tool for additional data models, such as ASN.1. This extension will broaden the range of databases that can be included in an OPM multidatabase system.