Hi Jari,

I have some thoughts and questions regarding the XCAP Diff Event draft
(draft-urpalainen-sip-xcap-diff-event-01).
What will the notification look like if a requested document cannot be
found? No body or only <xcap-diff> element? What does it mean if a
notification contains the document element with doc-selector but no etag
attributes? 
OMA has implemented an architecure where the XCAP server has been split
up into so called XCAP Document Management Servers (XDMS). Each XDMS
handles separate AUIDs. If a subscription is for several documents
distributed over several XDMSes (different auids), what should then the
notification look like if there are some documents that don't exist or
directories that are empty and there are some documents that cannot be
reached because one XDMS does not answer?
According to RFC 3265 the "pending" value of the Subscripton-State
header indicates that the subscription has been received, but that
policy information is insufficient to accept or deny the subscription at
this time. Is the intention in section 4.7 in the draft that the
subscription state should be pending if the resource the subscription is
for cannot be found? What would then the subscription state be for a
subscription for white space separated resources where some can be found
and some cannot be found?
Generation of a "first full response" notification might take time
especially if the subscription is for several AUIDs, spread over several
XCAP Document Management Servers, at the same time. Is there a need for
an "initial" initial notification that may be sent to the subscriber
before the "full response" can be sent?
Chapter 4.7, second paragraph
It is unclear to me what is meant by "...it MUST fall back to sending
all component changes again for this resource." Is the intention that
the server shall send a "full response" as in an initial notification
(my preferred interpretation)? Or is the intention that the server shall
send several notifications with the patches not aggregated?
Best regards,
Sofie

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