HP DDL D40 Reference Manual page 357

Dictionary Maintenance
DDL EDIT command; if you exit from DDL, you run the editor from the command
interpreter.
6. Compile the DDL source file. If you are still in an interactive session, use the
SOURCE command to submit the source file to the compiler. If you exited from
DDL after Step 4, run the DDL compiler from the command interpreter specifying
the DDL source file as the input file.
Suppose postal zip codes must be changed from five digits to nine digits. The sample
database schema in
ZIP-CD, which is referenced by three definitions (SUPPINFO, CUSTINFO, and ADDR)
and by two records (SUPPLIER and CUSTOMER). The following example illustrates
the statements and commands you can use to modify ZIP-CD. The example on the
following page shows an interactive session and includes the compiler response to
each statement and command.
Data Definition Language (DDL) Reference Manual—426798-002
Appendix B, Sample
10 -11
Modifying Referenced Objects
Schemas, includes a definition of the object