## subtitle

subtitle — The subtitle of a document.

## Synopsis

subtitle ::=

• Zero or more of:

## Description

A `subtitle` identifies the subtitle of a document, or portion of a document.

Titles are so common, and so often the only “info” elements associated with their parent, that they (`title`, `subtitle`, and `titleabbrev`) are allowed outside the `info` element. This is a tradeoff favoring author convenience over a small amount of additional complexity in processing. However, the title elements must either all be outside of the `info` wrapper or all inside, you cannot have some outside and some inside.

### Processing expectations

Formatted as a displayed block.

### Parents

These elements contain `subtitle`: .