First you will also need to add a dependency for the SideKick plugin in your plugin's property file:

plugin.MyPlugin.depend.n=plugin sidekick.SideKickPlugin 0.1

Note that you must replace n with the appropriate number, as dependency properties must have consecutive numbers.

All SideKick plugin classes are in the sidekick package; you will need to add import statements where appropriate.

Parser instances must be registered using the services.xml file. With this, you define a service which returns a derived instance of SideKickParser

<?xml version="1.0"?>

<!DOCTYPE SERVICES SYSTEM "services.dtd">

<SERVICES>
        <SERVICE CLASS="sidekick.SideKickParser" NAME="xml">
                new xml.parser.SAXParserImpl();
        </SERVICE>
</SERVICES>