Declare a relational database object:

       DTR> DECLARE DATABASE MY_DB ON DTR$LIBRARY:PERSONNEL.RDB ;
       DTR>

       Declare a Oracle CODASYL DBMS database instance. The Oracle
       CDD/Repository path name of the schema is
       CDD$COMPATIBILITY.DTR$LIB.DEMO.DBMS.PARTS.
       The name of the subschema is DTR_SUBSCHEMA,
       and the root file is DTR$LIBRARY:DTRPARTDB.ROO:

       DTR> DECLARE DATABASE MY_PARTS_DB USING SUBSCHEMA DTR_SUBSCHEMA
       DFN> OF SCHEMA CDD$COMPATIBILITY.DTR$LIB.DEMO.DBMS.PARTS
       DFN> ON DTR$LIBRARY:DTRPARTDB.ROO ;