## subtitle

subtitle — The subtitle of a document.

subtitle ::=

## 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.

### Children

The following elements occur in `subtitle`: text, `abbrev`, `acronym`, `alt`, `anchor`, `author`, `biblioref`, `citation`, `citebiblioid`, `citetitle`, `coref`, `date`, `editor`, `email`, `emphasis` (db._emphasis), `emphasis` (db.emphasis), `firstterm` (db._firstterm), `firstterm` (db.firstterm), `footnote`, `footnoteref`, `foreignphrase` (db._foreignphrase), `foreignphrase` (db.foreignphrase), `glossterm` (db._glossterm), `glossterm` (db.glossterm), `indexterm` (db.indexterm.endofrange), `indexterm` (db.indexterm.singular), `indexterm` (db.indexterm.startofrange), `inlineequation`, `inlinemediaobject`, `inlinestagedir`, `jobtitle`, `link`, `literal`, `olink`, `optional`, `org`, `orgname`, `person`, `personname`, `phrase` (db._phrase), `phrase` (db.phrase), `productname`, `productnumber`, `quote` (db._quote), `quote` (db.quote), `remark`, `revnumber`, `subscript`, `superscript`, `templatename`, `termdef`, `trademark`, `uri`, `wordasword`, `xref`.