The admin can then modify the member list if desired. In order to do so, the admin MUST send the changed items (i.e., only the "delta") to the service; each item MUST include the 'affiliation' attribute (normally set to a value of "member" or "none") and 'jid' attribute but SHOULD NOT include the 'nick' attribute (unless modifying the user's reserved nickname) and MUST NOT include the 'role' attribute (which is used to manage roles such as participant rather than affiliations such as member):
+The admin can then modify the member list if desired. In order to do so, the admin MUST send the changed items (i.e., only the "delta") to the service. Each item MUST include the 'affiliation' attribute (normally set to a value of "member" or "none") and 'jid' attribute. It SHOULD NOT include the 'nick' attribute, unless the reserved nickname was modified. To unset a reserved nickname, the 'nick' attribute must be set to an empty string. It MUST NOT include the 'role' attribute (which is used to manage roles such as participant rather than affiliations such as member).