Reason for or purpose of an alternate title (for example, “ toc ” for a title used in a table of contents, “ rt-running ” for a right-running-head title for print).
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | A word or phrase describing the rationale for this version of the title, for example, “ right-running-head ” |
| Restriction: This attribute may be specified if the element is used. | |