Use of different identifier formats
TS-0001 Clause 7.2 states the following: The format (i.e. CSE-relative, SP-relative or absolute) of resource identifier (e.g. the To parameter, accessControlPolicyIDs attribute) shall be correctly set by the Originator in an initial request, while the format of AE-ID or CSE-ID in the From parameter shall be set in a shortest format by the Originator in the initial request and it shall be converted in another format by the Registrar CSE or IN-CSE as the following
According to the bold text, in case of an announcement, the Hosting CSE is in charge of setting properly the identifier format of certain attributes that contain resource references.
From some comments received in stackoverflow, this seems to be a bit vague, not clear enough which attributes need to be format translated. A suggestion is made to define a list of attributes that need this kind of format translation when these situations (for instance, announcement) arise, and include this information in the XSD files if possible.