announceTo This attribute may be included in a CREATE or UPDATE Request in which case it contains a list of addresses / CSE - IDs where the resource is to be announced . For the case that CSE - IDs are provided , the announced - to CSE shall decide the location of the announced resources based on the rules described in clause 9 . 6 . 26 . 　 For the original resource , this attribute shall only be present if it has been successfully announced to other CSEs . This attribute maintains the list of the resource addresses to the successfully announced resources . Updates on this attribute will trigger new resource announcement or de - announcement .