The RULES and VARIABLES files can be useful
            when editing a CCL file. They provide information on valid options, variables, and
            dependencies. Both files are located in <CFXROOT>/etc/
            and can be viewed in any text editor.
Note:  In some cases, the RULES and VARIABLES
                files contain information about variables, parameters, models and options that are
                not yet fully supported in the CFX-Solver. Use caution with features that are not
                documented elsewhere as these may cause the CFX-Solver to fail or produce invalid
                results.