I/O data elements identify the input, output, and input/output fields in the code for a rule. You can specify the fields manually.
Use the autoretrieve feature to match I/O data elements with the business names you've assigned to them in your project glossary. A business name identifies the business function of a variable in natural language, and is invaluable in documenting and retrieving business rules. The field PLC_NUM, for example, might have the business name Policy Number.