Creates a temporary database object that specifies a relational
       database (Format 1) or a Oracle CODASYL DBMS database instance
       (Format 2).

       Format 1

         DECLARE DATABASE  rdb-database-name  ON  root-file-spec;

       Format 2

         DECLARE DATABASE  dbms-database-name

              [USING]  [SUBSCHEMA]  subschema-name

              [OF]  [SCHEMA]  schema-path-name

              ON  root-file-spec;

1  –  Arguments

    rdb-database-name

       Is the name of the relational database you want to declare.
       It must be a simple name.

    root-file-spec

       Is the name of the database root file. For relational databases,
       the default file type is .RDB; for Oracle CODASYL DBMS, the
       default file type is .ROO. A complete file specification has
       the following format:

       node-spec::device:[directory]file-name.type;version

    dbms-database-name

       Is the name you choose for the Oracle CODASYL DBMS database
 instance.
       It must be a simple name.

    subschema-name

       Is the name of a subschema for the specified schema.

    schema-path-name

       Is the dictionary path name of a Oracle CODASYL DBMS schema.

    ;(semicolon)

       Ends the DECLARE DATABASE command.

2  –  Examples

       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 ;