The RDML preprocessor can operate on an OpenVMS system that has
    Oracle Rdb installed.

    To invoke the RDML preprocessor, you must first define a symbol.
    For example:

    $ RDML :== $RDML
    $ RDML/PASCAL SALARY_PLAN.RPA

    You must preprocess any programs that contain RDML statements
    before processing them with the C or Pascal compiler.