core-jgi/plugins/pipo/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension
         point="org.adempiere.base.IDictionaryService">
      <client
            class="org.adempiere.pipo.PipoDictionaryService">
      </client>
   </extension>

</plugin>