| sub.header | Index Level | summary |
| Syntax | |
| Category | Attribute-Defining Item |
| Type | Attribute-Defining Item |
| Description | references attribute 3 of attribute-defining items and describes the substitute header for that attribute. |
| Options | |
| See Also | attribute-defining items |
| Example | |
| Warnings | |
| Compatibility | D3 7.0 AP |
| sub.header | Index Level | summary |