Name
mediaobject — A displayed media object (video, audio, image, etc.)
Synopsis
mediaobject ::=
(info? db.titleforbidden.info,
alt?, (audioobject |
imageobject | imageobjectco |
textobject | videoobject)+,
caption? db.caption)
Description
This element contains a set of alternative “media objects.” Exactly one object will be selected and rendered.
Processing expectations
Formatted as a displayed block. The primary purpose of the
mediaobject is to provide a wrapper around a set of
alternative presentations of the same information.
If possible, the processing system should use the content of the
first object within the mediaobject. If the first
object cannot be used, the remaining objects should be considered in
the order that they occur. A processor should use the first object
that it can, although it is free to choose any of the remaining
objects if the primary one cannot be used.
Under no circumstances should more than one object in a
mediaobject be used or presented at the same
time.
For example, a mediaobject might contain a
video, a high-resolution image, a low-resolution image, a long text
description, and a short text description. In a “high-end” online
system, the video is used. For print publishing, the high-resolution
image is used. For other online systems, either the high- or the
low-resolution image is used, possibly including the short text
description as the online alternative. In a text-only environment,
either the long or the short text description is used.
Examples
<article xmlns='http://docbook.org/ns/docbook'
xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Example mediaobject</title>
<mediaobject>
<info>
<othercredit>
<orgname>O'Reilly Media</orgname>
</othercredit>
<othercredit>
<orgname>Dover Archives</orgname>
</othercredit>
</info>
<alt>The DocBook: TDG Duck</alt>
<imageobject>
<imagedata align="right" width="6in" format="PNG"
fileref="figures/duck-small.png"/>
</imageobject>
<imageobject>
<imagedata align="right" width="6in" format="GIF"
fileref="figures/duck-small.gif"/>
</imageobject>
<textobject>
<para>The bird on the cover of <citetitle>DocBook: The Definitive
Guide</citetitle> is a wood duck. Often considered one of the most
beautiful ducks in North America, the male wood duck has a metallic
purple and green head with white streaks extending from its bill
around the eyes and down to its blue and green, gold-flecked
wings. It has a white neck, chestnut-colored chest, white or red
bill, and yellow-orange legs and feet. Females have more brown, gray,
and subdued hues.</para>
</textobject>
</mediaobject>
</article>