//Changes opencms-workplace.xml

<explorertype name="navigation" key="fileicon.navigation" icon="navigation.png" reference="xmlcontent">
  <newresource uri="newresource_xmlcontent.jsp?newresourcetype=navigation" order="145" autosetnavigation="false" autosettitle="false" info="desc.navigation"/>
  <accesscontrol>
    <accessentry principal="DEFAULT" permissions="+r+v"/>
    <accessentry principal="ROLE.VFS_MANAGER" permissions="+r+v+w+c"/>
    <accessentry principal="GROUP.Guests" permissions="-r-v-w-c"/>
  </accesscontrol>
</explorertype>

//Changes opencms-vfs.xml <resourcetypes>

<type class="org.opencms.file.types.CmsResourceTypeXmlContent" name="navigation" id="166">
  <param name="schema">/system/shared/navigation/navigation.xsd</param>
  <param name="resource.flag.internal">true</param>
</type>