bundles/org.eclipse.e4.ui.css.swt.theme/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension-point id="org.eclipse.e4.ui.css.swt.theme" name="Themes" schema="schema/org.eclipse.e4.ui.css.swt.theme.exsd"/>

</plugin>