- **TopNavElement** 
    * **Type**: ECHO_collection
    * **Listed**: TopNavigationBar (always)
    * **Responsible Template**: main_template
    * **Location**: /echo_nav/echo_pages/
  - **[[echo_groups|Group]]**
    * **Type**: ECHO_group
    * **Listed**: sideNavigationBar (always)
    * **Responsible Template**: group_template
    * **Location**: /echo_nav/echo_pages/[topNavElement]/
  - **[[echo_links|Link]]**
    * **Type**: ECHO_link
    * **Listed**: sideNavigationBar, body (when group is selected)
    * **Responsible Template**: collection_template or link_template
    * **Location**: /echo_nav/echo_pages/[topNavElement]/[Group]/
  - **[[echo_collections|Collection]]**
    * **Type**: ECHO_collection
    * **Listed**: sideNavigationBar, body (when group is selected)
    * **Responsible Template**: collection_template
    * **Location**: /echo_nav/echo_pages/[topNavElement]/[Group]/
  - **[[echo_resources|Resource]]**
    * **Type**: ECHO_resource
    * **Listed**: sideNavigationBar, body (when collection is selected)
    * **Responsible Template**: resource_template
    * **Location**: /echo_nav/echo_pages/[topNavElement]/[Group]/[Collection]
  - **ExternalLink**
    * **Type**: ECHO_externalLink
    * **Listed**: body (when group or collection is selected)
    * **Responsible Template**: externalLink_template
    * **Location**: /echo_nav/echo_pages/[topNavElement]/[Group]/[Collection] or /echo_nav/echo_pages/[topNavElement]/[Group]/[Collection]/[Resource]