$content
Set robots.txt action.
register_error($error)
Display an error on next page load.
system_message($message)
Display a system message on next page load.
elgg_echo($message_key, $args=array(), $language="")
Given a message key, returns an appropriately translated full-text string.
elgg_get_site_entity($site_guid=0)
Get an ElggSite entity (default is current site)