source: vbox/trunk/src/libs/dita-ot-1.8.5/docsrc/dev_ref/plugin-dependencies.dita@ 99040

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<reference id="plugin-dependencies" xml:lang="en-us">
<title>Managing plug-in dependencies</title>
<shortdesc>The <codeph>&lt;require></codeph> element in a <filepath>plugin.xml</filepath> file
is used to create a dependency on another plug-in. The <codeph>&lt;require></codeph> element
requires the <codeph>plugin</codeph> attribute in order to reference
the dependency.</shortdesc>
<refbody>
<section>       <p>If the current plug-in requires a plug-in with <codeph>id="plugin-id"</codeph> before
it can be installed, it would include the         following: </p> 
     <codeblock>&lt;require plugin="<i>plugin-id</i>"></codeblock> 
     <p>Prerequisite plug-ins are integrated before the current plug-in
is integrated. This does the         right thing with respect to XSLT
overrides. If your plug-in is a specialization of a         specialization,
it should <codeph>&lt;require></codeph> its base plug-ins, in order
from         general to specific. </p>       <p>If a prerequisite
plug-in is missing, a warning will be printed during integration.
To         suppress this, but keep the integration order if both plug-ins
are present, add           <codeph>importance="optional"</codeph> to
the <codeph>&lt;require></codeph> element. </p>       <p>If your plug-in
can depend on any one of several optional plug-ins, separate the plug-in
ids         with a vertical bar. This is most useful when combined
with importance="optional": </p>       </section>
<example><title>Example</title><p>The following plug-in will only
be installed if the plug-in with id="com.example.primary" is available.
If that one is not available, a warning will be generated during the
integration process.</p><codeblock>&lt;plugin id="com.example.builds-on-primary">
  &lt;!-- ...extensions here -->
  &lt;require plugin="com.example.primary"/>
&lt;/plugin></codeblock><p>The following plug-in will only be installed
if either the plug-in with id="pluginA" or the plug-in with id="pluginB"
are available. If neither of those are installed, the current plug-in
will be ignored.</p><codeblock>&lt;plugin id="pluginC">
  &lt;!-- ...extensions here -->
  &lt;require plugin="pluginA|pluginB" importance="optional"/>
&lt;/plugin></codeblock>       </example>
</refbody>
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