Proposed resolution for Issue 039: see attachment (docx document with
revision marks)
Cheers
Antoine
Antoine Mensch a écrit :
Additional
info:
Impact: implementation change
Urgency: Medium
Priority: High
Ram Jeyaraman a écrit :
This issue is assigned the number 039. For
further discussions on this issue, please refer to this issue number or
use this thread.
-----Original Message-----
From: Antoine Mensch [mailto:antoine.mensch@odonata.fr]
Sent: Tuesday, September 16, 2008 4:19 PM
To: Ram Jeyaraman
Subject: NEW Issue - Recursive hosting
Please defer discussions on this issue until a time this issue is
accepted and is assigned a number.
Document: DPWS
Location (defaults to line number): 541
Owner: Antoine Mensch
Description:
It is not clear whether the specification allows recursive hosting of
services: the wording seems to allow it, as Hosts are described in
terms
of services and not devices. On the other hand, two aspects of the
specification tend to indicate a single level of hosting: (i) the main
purpose of hosting is to let the host (device) advertise itself and its
hosted services through a single discovery message, thus avoiding
multiple multicast messages. As hosted services are not supposed to be
part of the discovery infrastructure (they will not advertise
themselves), it does not seem very useful to let them have hosted
services themselves. (ii) the rules for implied values for missing Host
or Hosted elements do not work well in case of multiple levels of
hosting: assume D is a device, A a hosted service hosted by D, and B a
hosted service hosted by A. What should be the values (both explicit
and
implied) of Host and Hosted in the response to a Get sent to A?
Proposed resolution:
This point needs clarification. There does not seem to be clear
requirements for recursive hosting (except perhaps moving UPnP models
to
DPWS)
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