callout.graphics.extension
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## callout.graphics.extension

callout.graphics.extension — Filename extension for callout graphics

## Synopsis

    <xsl:param name="callout.graphics.extension">.png</xsl:param>

## Description

Sets the filename extension to use on callout graphics.

The Docbook XSL distribution provides callout graphics in the following formats:

- SVG (extension: `.svg`)

- PNG (extension: `.png`)

- GIF (extension: `.gif`)

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