It took a while to track down, but I found the platform product files in
CVS:
:pserver:mailto:anonymous@xxxxxxxxxxxxxxx:/cvsroot/eclipse
org.eclipse.releng.eclipsebuilder
They've all got this:
<configurations>
<plugin id="org.eclipse.core.runtime" autoStart="true" startLevel="4"
/>
<plugin id="org.eclipse.equinox.common" autoStart="true"
startLevel="2" />
<plugin id="org.eclipse.equinox.ds" autoStart="true" startLevel="2"
/>
<plugin id="org.eclipse.equinox.p2.reconciler.dropins"
autoStart="true" startLevel="4" />
<plugin id="org.eclipse.equinox.simpleconfigurator" autoStart="true"
startLevel="1" />
<plugin id="org.eclipse.update.configurator" autoStart="true"
startLevel="3" />
<property name="org.eclipse.update.reconcile" value="false" />
<property name="osgi.bundles.defaultStartLevel" value="4" />
<property name="eclipse.buildId" value="@qualifier@"/>
</configurations>