Copy the com.oxygenxml.webhelp and
com.oxygenxml.highlight directories inside the
plugins directory of the DITA OT distribution. The
com.oxygenxml.highlight directory adds syntax highlight capabilities
to your WebHelp output for codeblock sections that contain source code
snippets (XML, Java, JavaScript etc.).
If you are using DITA-OT version 2.x, the WebHelp plugin contains
a plugin_2.x.xml which needs to be renamed to
plugin.xml.
In the home directory of the DITA Open Toolkit, run ant
-f integrator.xml.