| DocBook: The Definitive Guide 2.0.17 (Alpha)

# co

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co — The location of a callout embedded in text

## Synopsis

### Content Model

    co ::=
    EMPTY

### Attributes

Common attributes

Name | Type | Default
label | CDATA | None
linkends | IDREFS | None

## Description

A `CO` identifies (by its location) a point of reference for a callout. See `Callout`.

### Processing expectations

Formatted inline.

### Parents

These elements contain co: `computeroutput`, `literallayout`, `programlisting`, `prompt`, `replaceable`, `screen`, `synopsis`, `systemitem`, `userinput`.

## Attributes

label

  `Label` specifies an identifying number or string that may be used in presentation.

linkends

  `Linkends` points to the `Callout`(s) which refer to this `CO`. (This provides bidirectional linking, which may be useful in online presentation, for example.)

## See Also

`areaspec`, `calloutlist`, `coref`, `graphicco`, `imageobjectco`, `mediaobjectco`, `programlistingco`, `screenco`.

## Examples

For examples, see `screenco`.

cmdsynopsis |  | code

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